--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/calendar/calendar.el	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,2931 @@
+;;; calendar.el --- Calendar functions.  -*-byte-compile-dynamic: t;-*-
+
+;;; Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994 Free Software
+;;; Foundation, Inc.
+
+;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
+;; Keywords: calendar
+;; Human-Keywords: calendar, Gregorian calendar, Julian calendar, 
+;;	Hebrew calendar, Islamic calendar, ISO calendar, Julian day number,
+;;	diary, holidays
+
+;; This file is part of XEmacs.
+
+;; XEmacs is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; XEmacs is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with XEmacs; see the file COPYING.  If not, write to the Free
+;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; This collection of functions implements a calendar window.  It
+;; generates a calendar for the current month, together with the previous
+;; and coming months, or for any other three-month period.  The calendar
+;; can be scrolled forward and backward in the window to show months in
+;; the past or future; the cursor can move forward and backward by days,
+;; weeks, or months, making it possible, for instance, to jump to the
+;; date a specified number of days, weeks, or months from the date under
+;; the cursor.  The user can display a list of holidays and other notable
+;; days for the period shown; the notable days can be marked on the
+;; calendar, if desired.  The user can also specify that dates having
+;; corresponding diary entries (in a file that the user specifies) be
+;; marked; the diary entries for any date can be viewed in a separate
+;; window.  The diary and the notable days can be viewed independently of
+;; the calendar.  Dates can be translated from the (usual) Gregorian
+;; calendar to the day of the year/days remaining in year, to the ISO
+;; commercial calendar, to the Julian (old style) calendar, to the Hebrew
+;; calendar, to the Islamic calendar, to the French Revolutionary calendar,
+;; to the Mayan calendar, and to the astronomical (Julian) day number.
+;; When floating point is available, times of sunrise/sunset can be displayed,
+;; as can the phases of the moon.  Appointment notification for diary entries
+;; is available.
+
+;; The following files are part of the calendar/diary code:
+
+;;       cal-menu.el                   Menu support
+;;       cal-x.el                      X-windows dedicated frame functions
+;;       diary-lib.el, diary-ins.el    Diary functions
+;;       holidays.el                   Holiday functions
+;;       cal-french.el                 French Revolutionary calendar
+;;       cal-mayan.el                  Mayan calendars
+;;       cal-dst.el                    Daylight savings time rules
+;;       solar.el                      Sunrise/sunset, equinoxes/solstices
+;;       lunar.el                      Phases of the moon
+;;       appt.el                       Appointment notification
+
+;; Comments, corrections, and improvements should be sent to
+;;  Edward M. Reingold               Department of Computer Science
+;;  (217) 333-6733                   University of Illinois at Urbana-Champaign
+;;  reingold@cs.uiuc.edu             1304 West Springfield Avenue
+;;                                   Urbana, Illinois 61801
+
+;; GNU Emacs users too numerous to list pointed out a variety of problems
+;; with earlier forms of the `infinite' sliding calendar and suggested some
+;; of the features included in this package.  Especially significant in this
+;; regard was the suggestion of mark-diary-entries and view-diary-entries,
+;; together ideas for their implementation, by
+;;  Michael S. Littman		     Cognitive Science Research Group
+;;  (201) 829-5155                   Bell Communications Research
+;;  mlittman@wind.bellcore.com       445 South St. Box 1961 (2L-331)
+;;                                   Morristown, NJ  07960
+
+;; The algorithms for the Hebrew calendar are those of the Rambam (Rabbi Moses
+;; Maimonides), from his Mishneh Torah, as implemented by
+;;  Nachum Dershowitz                Department of Computer Science
+;;  (217) 333-4219                   University of Illinois at Urbana-Champaign
+;;  nachum@cs.uiuc.edu               1304 West Springfield Avenue
+;;                                   Urbana, Illinois 61801
+
+;; Technical details of all the calendrical calculations can be found in
+
+;; ``Calendrical Calculations'' by Nachum Dershowitz and Edward M. Reingold,
+;; Software--Practice and Experience, Volume 20, Number 9 (September, 1990),
+;; pages 899-928.  ``Calendrical Calculations, Part II: Three Historical
+;; Calendars'' by E. M. Reingold,  N. Dershowitz, and S. M. Clamen,
+;; Software--Practice and Experience, Volume 23, Number 4 (April, 1993),
+;; pages 383-404.
+
+;; Hard copies of these two papers can be obtained by sending email to
+;; reingold@cs.uiuc.edu with the SUBJECT "send-paper-cal" (no quotes) and
+;; the message BODY containing your mailing address (snail).
+
+;;; Code:
+
+(defun calendar-version ()
+  (interactive)
+  (message "Version 5.3, January 25, 1994"))
+
+;;;###autoload
+(defvar calendar-week-start-day 0
+  "*The day of the week on which a week in the calendar begins.
+0 means Sunday (default), 1 means Monday, and so on.")
+
+;;;###autoload
+(defvar calendar-offset 0
+  "*The offset of the principal month from the center of the calendar window.
+0 means the principal month is in the center (default), -1 means on the left,
++1 means on the right.  Larger (or smaller) values push the principal month off
+the screen.")
+
+;;;###autoload
+(defvar view-diary-entries-initially nil
+  "*Non-nil means display current date's diary entries on entry.
+The diary is displayed in another window when the calendar is first displayed,
+if the current date is visible.  The number of days of diary entries displayed
+is governed by the variable `number-of-diary-entries'.")
+
+;;;###autoload
+(defvar number-of-diary-entries 1
+  "*Specifies how many days of diary entries are to be displayed initially.
+This variable affects the diary display when the command M-x diary is used,
+or if the value of the variable `view-diary-entries-initially' is t.  For
+example, if the default value 1 is used, then only the current day's diary
+entries will be displayed.  If the value 2 is used, then both the current
+day's and the next day's entries will be displayed.
+
+The value can also be a vector such as [0 2 2 2 2 4 1]; this value
+says to display no diary entries on Sunday, the display the entries
+for the current date and the day after on Monday through Thursday,
+display Friday through Monday's entries on Friday, and display only
+Saturday's entries on Saturday.
+
+This variable does not affect the diary display with the `d' command
+from the calendar; in that case, the prefix argument controls the
+number of days of diary entries displayed.")
+
+;;;###autoload
+(defvar mark-diary-entries-in-calendar nil
+  "*Non-nil means mark dates with diary entries, in the calendar window.
+The marking symbol is specified by the variable `diary-entry-marker'.")
+
+(defvar diary-entry-marker
+  (progn
+    (make-face 'diary-face)
+    (cond ((face-differs-from-default-p 'diary-face) nil)
+	  (t (set-face-foreground 'diary-face "red" 'global '(x color))
+	     (set-face-highlight-p 'diary-face t 'global 'tty)
+	     ;; avoid a weird problem when byte-compiling appt.el
+	     ;; in batch mode.
+	     (if (and (not noninteractive) (fboundp 'x-make-font-bold))
+		 (let ((bfont (x-make-font-bold
+			       (face-font-instance 'default)))
+		       (mono-tag (list 'x 'mono))
+		       (gray-tag (list 'x 'grayscale)))
+		   (if bfont
+		       (progn
+			 (set-face-font 'diary-face bfont 'global mono-tag)
+			 (set-face-font 'diary-face bfont 'global
+					gray-tag)))))))
+    'diary-face)
+  "*Used to mark dates that have diary entries.
+Can be either a single-character string or a face.")
+
+(defvar calendar-today-marker
+  (progn
+    (make-face 'calendar-today-face)
+    (if (not (face-differs-from-default-p 'calendar-today-face))
+	(set-face-underline-p 'calendar-today-face t))
+    'calendar-today-face)
+  "*Used to mark today's date.
+Can be either a single-character string or a face.")
+
+(defvar calendar-holiday-marker
+  (progn
+    (make-face 'holiday-face)
+    (cond ((face-differs-from-default-p 'holiday-face) nil)
+	  (t (let ((color-tag (list 'x 'color))
+		   (mono-tag (list 'x 'mono))
+		   (gray-tag (list 'x 'grayscale)))
+	       (set-face-background 'holiday-face [default foreground] 'global
+				    mono-tag)
+	       (set-face-foreground 'holiday-face [default background] 'global
+				    mono-tag)
+	       (set-face-background 'holiday-face [default foreground] 'global
+				    gray-tag)
+	       (set-face-foreground 'holiday-face [default background] 'global
+				    gray-tag)
+	       (set-face-background 'holiday-face "pink" 'global color-tag)
+	       (set-face-reverse-p 'holiday-face t 'global 'tty))))
+    'holiday-face)
+  "*Used to mark notable dates in the calendar.
+Can be either a single-character string or a face.")
+
+;;;###autoload
+(defvar view-calendar-holidays-initially nil
+  "*Non-nil means display holidays for current three month period on entry.
+The holidays are displayed in another window when the calendar is first
+displayed.")
+
+;;;###autoload
+(defvar mark-holidays-in-calendar nil
+  "*Non-nil means mark dates of holidays in the calendar window.
+The marking symbol is specified by the variable `calendar-holiday-marker'.")
+
+;;;###autoload
+(defvar all-hebrew-calendar-holidays nil
+  "*If nil, show only major holidays from the Hebrew calendar.
+This means only those Jewish holidays that appear on secular calendars.
+
+If t, show all the holidays that would appear in a complete Hebrew calendar.")
+
+;;;###autoload
+(defvar all-christian-calendar-holidays nil
+  "*If nil, show only major holidays from the Christian calendar.
+This means only those Christian holidays that appear on secular calendars.
+
+If t, show all the holidays that would appear in a complete Christian
+calendar.")
+
+;;;###autoload
+(defvar all-islamic-calendar-holidays nil
+  "*If nil, show only major holidays from the Islamic calendar.
+This means only those Islamic holidays that appear on secular calendars.
+
+If t, show all the holidays that would appear in a complete Islamic
+calendar.")
+
+;;;###autoload
+(defvar calendar-load-hook nil
+  "*List of functions to be called after the calendar is first loaded.
+This is the place to add key bindings to `calendar-mode-map'.")
+
+;;;###autoload
+(defvar initial-calendar-window-hook nil
+  "*List of functions to be called when the calendar window is first opened.
+The functions invoked are called after the calendar window is opened, but
+once opened is never called again.  Leaving the calendar with the `q' command
+and reentering it will cause these functions to be called again.")
+
+;;;###autoload
+(defvar today-visible-calendar-hook nil
+  "*List of functions called whenever the current date is visible.
+This can be used, for example, to replace today's date with asterisks; a
+function `calendar-star-date' is included for this purpose:
+    (setq today-visible-calendar-hook 'calendar-star-date)
+It can also be used to mark the current date with `calendar-today-marker';
+a function is also provided for this:
+    (setq today-visible-calendar-hook 'calendar-mark-today)
+
+The corresponding variable `today-invisible-calendar-hook' is the list of
+functions called when the calendar function was called when the current
+date is not visible in the window.
+
+Other than the use of the provided functions, the changing of any
+characters in the calendar buffer by the hooks may cause the failure of the
+functions that move by days and weeks.")
+
+;;;###autoload
+(defvar today-invisible-calendar-hook nil
+  "*List of functions called whenever the current date is not visible.
+
+The corresponding variable `today-visible-calendar-hook' is the list of
+functions called when the calendar function was called when the current
+date is visible in the window.
+
+Other than the use of the provided functions, the changing of any
+characters in the calendar buffer by the hooks may cause the failure of the
+functions that move by days and weeks.")
+
+;;;###autoload
+(defvar diary-file "~/diary"
+  "*Name of the file in which one's personal diary of dates is kept.
+
+The file's entries are lines in any of the forms
+
+            MONTH/DAY
+            MONTH/DAY/YEAR
+            MONTHNAME DAY
+            MONTHNAME DAY, YEAR
+            DAYNAME
+
+at the beginning of the line; the remainder of the line is the diary entry
+string for that date.  MONTH and DAY are one or two digit numbers, YEAR is
+a number and may be written in full or abbreviated to the final two digits.
+If the date does not contain a year, it is generic and applies to any year.
+DAYNAME entries apply to any date on which is on that day of the week.
+MONTHNAME and DAYNAME can be spelled in full, abbreviated to three
+characters (with or without a period), capitalized or not.  Any of DAY,
+MONTH, or MONTHNAME, YEAR can be `*' which matches any day, month, or year,
+respectively.
+
+The European style (in which the day precedes the month) can be used
+instead, if you execute `european-calendar' when in the calendar, or set
+`european-calendar-style' to t in your .emacs file.  The European forms are
+
+            DAY/MONTH
+            DAY/MONTH/YEAR
+            DAY MONTHNAME
+            DAY MONTHNAME YEAR
+            DAYNAME
+
+To revert to the default American style from the European style, execute
+`american-calendar' in the calendar.
+
+A diary entry can be preceded by the character
+`diary-nonmarking-symbol' (ordinarily `&') to make that entry
+nonmarking--that is, it will not be marked on dates in the calendar
+window but will appear in a diary window.
+
+Multiline diary entries are made by indenting lines after the first with
+either a TAB or one or more spaces.
+
+Lines not in one the above formats are ignored.  Here are some sample diary
+entries (in the default American style):
+
+     12/22/1988 Twentieth wedding anniversary!!
+     &1/1. Happy New Year!
+     10/22 Ruth's birthday.
+     21: Payday
+     Tuesday--weekly meeting with grad students at 10am
+              Supowit, Shen, Bitner, and Kapoor to attend.
+     1/13/89 Friday the thirteenth!!
+     &thu 4pm squash game with Lloyd.
+     mar 16 Dad's birthday
+     April 15, 1989 Income tax due.
+     &* 15 time cards due.
+
+If the first line of a diary entry consists only of the date or day name with
+no trailing blanks or punctuation, then that line is not displayed in the
+diary window; only the continuation lines is shown.  For example, the
+single diary entry
+
+     02/11/1989
+      Bill Blattner visits Princeton today
+      2pm Cognitive Studies Committee meeting
+      2:30-5:30 Lizzie at Lawrenceville for `Group Initiative'
+      4:00pm Jamie Tappenden
+      7:30pm Dinner at George and Ed's for Alan Ryan
+      7:30-10:00pm dance at Stewart Country Day School
+
+will appear in the diary window without the date line at the beginning.  This
+facility allows the diary window to look neater, but can cause confusion if
+used with more than one day's entries displayed.
+
+Diary entries can be based on Lisp sexps.  For example, the diary entry
+
+      %%(diary-block 11 1 1990 11 10 1990) Vacation
+
+causes the diary entry \"Vacation\" to appear from November 1 through November
+10, 1990.  Other functions available are `diary-float', `diary-anniversary',
+`diary-cyclic', `diary-day-of-year', `diary-iso-date', `diary-french-date',
+`diary-hebrew-date', `diary-islamic-date', `diary-mayan-date',
+`diary-yahrzeit', `diary-sunrise-sunset', `diary-phases-of-moon',
+`diary-parasha', `diary-omer', `diary-rosh-hodesh', and
+`diary-sabbath-candles'.  See the documentation for the function
+`list-sexp-diary-entries' for more details.
+
+Diary entries based on the Hebrew and/or the Islamic calendar are also
+possible, but because these are somewhat slow, they are ignored
+unless you set the `nongregorian-diary-listing-hook' and the
+`nongregorian-diary-marking-hook' appropriately.  See the documentation
+for these functions for details.
+
+Diary files can contain directives to include the contents of other files; for
+details, see the documentation for the variable `list-diary-entries-hook'.")
+
+;;;###autoload
+(defvar diary-nonmarking-symbol "&"
+  "*Symbol indicating that a diary entry is not to be marked in the calendar.")
+
+;;;###autoload
+(defvar hebrew-diary-entry-symbol "H"
+  "*Symbol indicating a diary entry according to the Hebrew calendar.")
+
+;;;###autoload
+(defvar islamic-diary-entry-symbol "I"
+  "*Symbol indicating a diary entry according to the Islamic calendar.")
+
+;;;###autoload
+(defvar diary-include-string "#include"
+  "*The string indicating inclusion of another file of diary entries.
+See the documentation for the function `include-other-diary-files'.")
+
+;;;###autoload
+(defvar sexp-diary-entry-symbol "%%"
+  "*The string used to indicate a sexp diary entry in diary-file.
+See the documentation for the function `list-sexp-diary-entries'.")
+
+;;;###autoload
+(defvar abbreviated-calendar-year t
+  "*Interpret a two-digit year DD in a diary entry as either 19DD or 20DD.
+For the Gregorian calendar; similarly for the Hebrew and Islamic calendars.
+If this variable is nil, years must be written in full.")
+
+;;;###autoload
+(defvar european-calendar-style nil
+  "*Use the European style of dates in the diary and in any displays.
+If this variable is t, a date 1/2/1990 would be interpreted as February 1,
+1990.  The accepted European date styles are
+
+            DAY/MONTH
+            DAY/MONTH/YEAR
+            DAY MONTHNAME
+            DAY MONTHNAME YEAR
+            DAYNAME
+
+Names can be capitalized or not, written in full, or abbreviated to three
+characters with or without a period.")
+
+;;;###autoload
+(defvar american-date-diary-pattern
+  '((month "/" day "[^/0-9]")
+    (month "/" day "/" year "[^0-9]")
+    (monthname " *" day "[^,0-9]")
+    (monthname " *" day ", *" year "[^0-9]")
+    (dayname "\\W"))
+  "*List of pseudo-patterns describing the American patterns of date used.
+See the documentation of `diary-date-forms' for an explanation.")
+
+;;;###autoload
+(defvar european-date-diary-pattern
+  '((day "/" month "[^/0-9]")
+    (day "/" month "/" year "[^0-9]")
+    (backup day " *" monthname "\\W+\\<[^*0-9]")
+    (day " *" monthname " *" year "[^0-9]")
+    (dayname "\\W"))
+  "*List of pseudo-patterns describing the European patterns of date used.
+See the documentation of `diary-date-forms' for an explanation.")
+
+(defvar diary-date-forms
+  (if european-calendar-style
+      european-date-diary-pattern
+    american-date-diary-pattern)
+  "*List of pseudo-patterns describing the forms of date used in the diary.
+The patterns on the list must be MUTUALLY EXCLUSIVE and must should not match
+any portion of the diary entry itself, just the date component.
+
+A pseudo-pattern is a list of regular expressions and the keywords `month',
+`day', `year', `monthname', and `dayname'.  The keyword `monthname' will
+match the name of the month, capitalized or not, or its three-letter
+abbreviation, followed by a period or not; it will also match `*'.
+Similarly, `dayname' will match the name of the day, capitalized or not, or
+its three-letter abbreviation, followed by a period or not.  The keywords
+`month', `day', and `year' will match those numerical values, preceded by
+arbitrarily many zeros; they will also match `*'.
+
+The matching of the diary entries with the date forms is done with the
+standard syntax table from Fundamental mode, but with the `*' changed so
+that it is a word constituent.
+
+If, to be mutually exclusive, a pseudo-pattern must match a portion of the
+diary entry itself, the first element of the pattern MUST be `backup'.  This
+directive causes the date recognizer to back up to the beginning of the
+current word of the diary entry, so in no case can the pattern match more than
+a portion of the first word of the diary entry.")
+
+;;;###autoload
+(defvar european-calendar-display-form
+  '((if dayname (concat dayname ", ")) day " " monthname " " year)
+  "*Pseudo-pattern governing the way a date appears in the European style.
+See the documentation of calendar-date-display-form for an explanation.")
+
+;;;###autoload
+(defvar american-calendar-display-form
+  '((if dayname (concat dayname ", ")) monthname " " day ", " year)
+  "*Pseudo-pattern governing the way a date appears in the American style.
+See the documentation of `calendar-date-display-form' for an explanation.")
+
+(defvar calendar-date-display-form
+  (if european-calendar-style
+      european-calendar-display-form
+    american-calendar-display-form)
+  "*Pseudo-pattern governing the way a date appears.
+
+Used by the function `calendar-date-string', a pseudo-pattern is a list of
+expressions that can involve the keywords `month', `day', and `year', all
+numbers in string form, and `monthname' and `dayname', both alphabetic
+strings.  For example, the ISO standard would use the pseudo- pattern
+
+       '(year \"-\" month \"-\" day)
+
+while a typical American form would be
+
+       '(month \"/\" day \"/\" (substring year -2))
+
+and
+
+       '((format \"%9s, %9s %2s, %4s\" dayname monthname day year))
+
+would give the usual American style in fixed-length fields.
+
+See the documentation of the function `calendar-date-string'.")
+
+(defun european-calendar ()
+  "Set the interpretation and display of dates to the European style."
+  (interactive)
+  (setq european-calendar-style t)
+  (setq calendar-date-display-form european-calendar-display-form)
+  (setq diary-date-forms european-date-diary-pattern)
+  (update-calendar-mode-line))
+
+(defun american-calendar ()
+  "Set the interpretation and display of dates to the American style."
+  (interactive)
+  (setq european-calendar-style nil)
+  (setq calendar-date-display-form american-calendar-display-form)
+  (setq diary-date-forms american-date-diary-pattern)
+  (update-calendar-mode-line))
+
+;;;###autoload
+(defvar print-diary-entries-hook 'lpr-buffer
+  "*List of functions called after a temporary diary buffer is prepared.
+The buffer shows only the diary entries currently visible in the diary
+buffer.  The default just does the printing.  Other uses might include, for
+example, rearranging the lines into order by day and time, saving the buffer
+instead of deleting it, or changing the function used to do the printing.")
+
+;;;###autoload
+(defvar list-diary-entries-hook nil
+  "*List of functions called after diary file is culled for relevant entries.
+It is to be used for diary entries that are not found in the diary file.
+
+A function `include-other-diary-files' is provided for use as the value of
+this hook.  This function enables you to use shared diary files together
+with your own.  The files included are specified in the diary file by lines
+of the form
+
+        #include \"filename\"
+
+This is recursive; that is, #include directives in files thus included are
+obeyed.  You can change the \"#include\" to some other string by changing
+the variable `diary-include-string'.  When you use `include-other-diary-files'
+as part of the list-diary-entries-hook, you will probably also want to use the
+function `mark-included-diary-files' as part of `mark-diary-entries-hook'.
+
+For example, you could use
+
+     (setq list-diary-entries-hook
+       '(include-other-diary-files sort-diary-entries))
+     (setq diary-display-hook 'fancy-diary-display)
+
+in your `.emacs' file to cause the fancy diary buffer to be displayed with
+diary entries from various included files, each day's entries sorted into
+lexicographic order.")
+
+;;;###autoload
+(defvar diary-hook nil
+  "*List of functions called after the display of the diary.
+Can be used for appointment notification.")
+
+;;;###autoload
+(defvar diary-display-hook nil
+  "*List of functions that handle the display of the diary.
+If nil (the default), `simple-diary-display' is used.  Use `ignore' for no
+diary display.
+
+Ordinarily, this just displays the diary buffer (with holidays indicated in
+the mode line), if there are any relevant entries.  At the time these
+functions are called, the variable `diary-entries-list' is a list, in order
+by date, of all relevant diary entries in the form of ((MONTH DAY YEAR)
+STRING), where string is the diary entry for the given date.  This can be
+used, for example, a different buffer for display (perhaps combined with
+holidays), or produce hard copy output.
+
+A function `fancy-diary-display' is provided as an alternative
+choice for this hook; this function prepares a special noneditable diary
+buffer with the relevant diary entries that has neat day-by-day arrangement
+with headings.  The fancy diary buffer will show the holidays unless the
+variable `holidays-in-diary-buffer' is set to nil.  Ordinarily, the fancy
+diary buffer will not show days for which there are no diary entries, even
+if that day is a holiday; if you want such days to be shown in the fancy
+diary buffer, set the variable `diary-list-include-blanks' to t.")
+
+;;;###autoload
+(defvar nongregorian-diary-listing-hook nil
+  "*List of functions called for listing diary file and included files.
+As the files are processed for diary entries, these functions are used to cull
+relevant entries.  You can use either or both of `list-hebrew-diary-entries'
+and `list-islamic-diary-entries'.  The documentation for these functions
+describes the style of such diary entries.")
+
+;;;###autoload
+(defvar mark-diary-entries-hook nil
+  "*List of functions called after marking diary entries in the calendar.
+
+A function `mark-included-diary-files' is also provided for use as the
+mark-diary-entries-hook; it enables you to use shared diary files together
+with your own.  The files included are specified in the diary file by lines
+of the form
+        #include \"filename\"
+This is recursive; that is, #include directives in files thus included are
+obeyed.  You can change the \"#include\" to some other string by changing the
+variable `diary-include-string'.  When you use `mark-included-diary-files' as
+part of the mark-diary-entries-hook, you will probably also want to use the
+function `include-other-diary-files' as part of `list-diary-entries-hook'.")
+
+;;;###autoload
+(defvar nongregorian-diary-marking-hook nil
+  "*List of functions called for marking diary file and included files.
+As the files are processed for diary entries, these functions are used to cull
+relevant entries.  You can use either or both of `mark-hebrew-diary-entries'
+and `mark-islamic-diary-entries'.  The documentation for these functions
+describes the style of such diary entries.")
+
+;;;###autoload
+(defvar diary-list-include-blanks nil
+  "*If nil, do not include days with no diary entry in the list of diary entries.
+Such days will then not be shown in the the fancy diary buffer, even if they
+are holidays.")
+
+;;;###autoload
+(defvar holidays-in-diary-buffer t
+  "*Non-nil means include holidays in the diary display.
+The holidays appear in the mode line of the diary buffer, or in the
+fancy diary buffer next to the date.  This slows down the diary functions
+somewhat; setting it to nil makes the diary display faster.")
+
+(defvar calendar-mark-ring nil)
+
+;;;###autoload
+(put 'general-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar general-holidays
+  '((holiday-fixed 1 1 "New Year's Day")
+    (holiday-float 1 1 3 "Martin Luther King Day")
+    (holiday-fixed 2 2 "Ground Hog Day")
+    (holiday-fixed 2 14 "Valentine's Day")
+    (holiday-float 2 1 3 "President's Day")
+    (holiday-fixed 3 17 "St. Patrick's Day")
+    (holiday-fixed 4 1 "April Fool's Day")
+    (holiday-float 5 0 2 "Mother's Day")
+    (holiday-float 5 1 -1 "Memorial Day")
+    (holiday-fixed 6 14 "Flag Day")
+    (holiday-float 6 0 3 "Father's Day")
+    (holiday-fixed 7 4 "Independence Day")
+    (holiday-float 9 1 1 "Labor Day")
+    (holiday-float 10 1 2 "Columbus Day")
+    (holiday-fixed 10 31 "Halloween")
+    (holiday-fixed 11 11 "Veteran's Day")
+    (holiday-float 11 4 4 "Thanksgiving"))
+  "*General holidays.  Default value is for the United States.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'local-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar local-holidays nil
+  "*Local holidays.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'other-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar other-holidays nil
+  "*User defined holidays.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'hebrew-holidays-1 'risky-local-variable t)
+;;;###autoload
+(defvar hebrew-holidays-1
+  '((holiday-rosh-hashanah-etc)
+    (if all-hebrew-calendar-holidays
+        (holiday-julian
+         11
+         (let* ((m displayed-month)
+                (y displayed-year)
+                (year))
+           (increment-calendar-month m y -1)
+           (let ((year (extract-calendar-year
+                        (calendar-julian-from-absolute
+                         (calendar-absolute-from-gregorian
+                          (list m 1 y))))))
+             (if (zerop (% (1+ year) 4))
+                 22
+               21))) "\"Tal Umatar\" (evening)"))))
+
+;;;###autoload
+(put 'hebrew-holidays-2 'risky-local-variable t)
+;;;###autoload
+(defvar hebrew-holidays-2
+  '((if all-hebrew-calendar-holidays
+        (holiday-hanukkah)
+      (holiday-hebrew 9 25 "Hanukkah"))
+    (if all-hebrew-calendar-holidays
+      (holiday-hebrew
+       10
+       (let ((h-year (extract-calendar-year
+                      (calendar-hebrew-from-absolute
+                       (calendar-absolute-from-gregorian
+                        (list displayed-month 28 displayed-year))))))
+         (if (= (% (calendar-absolute-from-hebrew (list 10 10 h-year))
+                   7)
+                6)
+             11 10))
+       "Tzom Teveth"))
+    (if all-hebrew-calendar-holidays
+        (holiday-hebrew 11 15 "Tu B'Shevat"))))
+
+;;;###autoload
+(put 'hebrew-holidays-3 'risky-local-variable t)
+;;;###autoload
+(defvar hebrew-holidays-3
+  '((if all-hebrew-calendar-holidays
+        (holiday-hebrew
+         11
+         (let ((m displayed-month)
+               (y displayed-year))
+           (increment-calendar-month m y 1)
+           (let* ((h-year (extract-calendar-year
+                           (calendar-hebrew-from-absolute
+                            (calendar-absolute-from-gregorian
+                             (list m
+                                   (calendar-last-day-of-month m y)
+                                   y)))))
+                  (s-s
+                   (calendar-hebrew-from-absolute
+                    (if (=
+                         (% (calendar-absolute-from-hebrew
+                             (list 7 1 h-year))
+                            7)
+                         6)
+                        (calendar-dayname-on-or-before
+                         6 (calendar-absolute-from-hebrew
+                            (list 11 17 h-year)))
+                      (calendar-dayname-on-or-before
+                       6 (calendar-absolute-from-hebrew
+                          (list 11 16 h-year))))))
+                  (day (extract-calendar-day s-s)))
+             day))
+         "Shabbat Shirah"))))
+
+;;;###autoload
+(put 'hebrew-holidays-4 'risky-local-variable t)
+;;;###autoload
+(defvar hebrew-holidays-4
+  '((holiday-passover-etc)
+    (if (and all-hebrew-calendar-holidays
+             (let* ((m displayed-month)
+                    (y displayed-year)
+                    (year))
+               (increment-calendar-month m y -1)
+               (let ((year (extract-calendar-year
+                            (calendar-julian-from-absolute
+                             (calendar-absolute-from-gregorian
+                              (list m 1 y))))))
+                 (= 21 (% year 28)))))
+        (holiday-julian 3 26 "Kiddush HaHamah"))
+    (if all-hebrew-calendar-holidays
+        (holiday-tisha-b-av-etc))))
+
+;;;###autoload
+(put 'hebrew-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar hebrew-holidays (append hebrew-holidays-1 hebrew-holidays-2
+				hebrew-holidays-3 hebrew-holidays-4)
+  "*Jewish holidays.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'christian-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar christian-holidays
+  '((if all-christian-calendar-holidays
+        (holiday-fixed 1 6 "Epiphany"))
+    (holiday-easter-etc)
+    (if all-christian-calendar-holidays
+        (holiday-greek-orthodox-easter))
+    (if all-christian-calendar-holidays
+        (holiday-fixed 8 15 "Assumption"))
+    (if all-christian-calendar-holidays
+        (holiday-advent))
+    (holiday-fixed 12 25 "Christmas")
+    (if all-christian-calendar-holidays
+        (holiday-julian 12 25 "Eastern Orthodox Christmas")))
+  "*Christian holidays.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'islamic-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar islamic-holidays
+  '((holiday-islamic
+     1 1
+     (format "Islamic New Year %d"
+             (let ((m displayed-month)
+                   (y displayed-year))
+               (increment-calendar-month m y 1)
+               (extract-calendar-year
+                (calendar-islamic-from-absolute
+                 (calendar-absolute-from-gregorian
+                  (list
+                   m (calendar-last-day-of-month m y) y)))))))
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 1 10 "Ashura"))
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 3 12 "Mulad-al-Nabi"))
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 7 26 "Shab-e-Mi'raj"))
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 8 15 "Shab-e-Bara't"))
+    (holiday-islamic 9 1 "Ramadan Begins")
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 9 27 "Shab-e Qadr"))
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 10 1 "Id-al-Fitr"))
+    (if all-islamic-calendar-holidays
+        (holiday-islamic 12 10 "Id-al-Adha")))
+  "*Islamic holidays.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'solar-holidays 'risky-local-variable t)
+;;;###autoload
+(defvar solar-holidays
+  '((if (fboundp 'atan)
+	(solar-equinoxes-solstices))
+    (if (progn
+	  (require 'cal-dst)
+	  t)
+      (funcall
+       'holiday-sexp
+        calendar-daylight-savings-starts
+        '(format "Daylight Savings Time Begins %s"
+                  (if (fboundp 'atan)
+                      (solar-time-string
+                       (/ calendar-daylight-savings-starts-time (float 60))
+                       calendar-standard-time-zone-name)
+                    ""))))
+    (funcall
+     'holiday-sexp
+     calendar-daylight-savings-ends
+     '(format "Daylight Savings Time Ends %s"
+              (if (fboundp 'atan)
+                  (solar-time-string
+                   (/ calendar-daylight-savings-ends-time (float 60))
+                   calendar-daylight-time-zone-name)
+                ""))))
+  "*Sun-related holidays.
+See the documentation for `calendar-holidays' for details.")
+
+;;;###autoload
+(put 'calendar-holidays 'risky-local-variable t)
+(defvar calendar-holidays
+  (append general-holidays local-holidays other-holidays
+          christian-holidays hebrew-holidays islamic-holidays
+          solar-holidays)
+  "*List of notable days for the command M-x holidays.
+
+Additional holidays are easy to add to the list, just put them in the list
+`other-holidays' in your .emacs file.  Similarly, by setting any of
+`general-holidays', `local-holidays' `christian-holidays', `hebrew-holidays',
+`islamic-holidays', or `solar-holidays' to nil in your .emacs file, you can
+eliminate unwanted categories of holidays.  The intention is that (in the US)
+`local-holidays' be set in site-init.el and `other-holidays' be set by the
+user.
+
+Entries on the list are expressions that return (possibly empty) lists of
+items of the form ((month day year) string) of a holiday in the in the
+three-month period centered around `displayed-month' of `displayed-year'.
+Several basic functions are provided for this purpose:
+
+    (holiday-fixed MONTH DAY STRING) is a fixed date on the Gregorian calendar
+    (holiday-float MONTH DAYNAME K STRING &optional day) is the Kth DAYNAME in
+                               MONTH on the Gregorian calendar (0 for Sunday,
+                               etc.); K<0 means count back from the end of the
+                               month. An optional parameter DAY means the Kth
+                               DAYNAME after/before MONTH DAY.
+    (holiday-hebrew MONTH DAY STRING)  a fixed date on the Hebrew calendar
+    (holiday-islamic MONTH DAY STRING) a fixed date on the Islamic calendar
+    (holiday-julian MONTH DAY STRING)  a fixed date on the Julian calendar
+    (holiday-sexp SEXP STRING) SEXP is a Gregorian-date-valued expression
+                               in the variable `year'; if it evaluates to
+                               a visible date, that's the holiday; if it
+                               evaluates to nil, there's no holiday.  STRING
+                               is an expression in the variable `date'.
+
+For example, to add Bastille Day, celebrated in France on July 14, add
+
+     (holiday-fixed 7 14 \"Bastille Day\")
+
+to the list.  To add Hurricane Supplication Day, celebrated in the Virgin
+Islands on the fourth Monday in August, add
+
+     (holiday-float 8 1 4 \"Hurricane Supplication Day\")
+
+to the list (the last Monday would be specified with `-1' instead of `4').
+To add the last day of Hanukkah to the list, use
+
+     (holiday-hebrew 10 2 \"Last day of Hanukkah\")
+
+since the Hebrew months are numbered with 1 starting from Nisan, while to
+add the Islamic feast celebrating Mohammed's birthday use
+
+     (holiday-islamic 3 12 \"Mohammed's Birthday\")
+
+since the Islamic months are numbered from 1 starting with Muharram.  To
+add Thomas Jefferson's birthday, April 2, 1743 (Julian), use
+
+     (holiday-julian 4 2 \"Jefferson's Birthday\")
+
+To include a holiday conditionally, use the sexp form or a conditional.  For
+example, to include American presidential elections, which occur on the first
+Tuesday after the first Monday in November of years divisible by 4, add
+
+     (holiday-sexp
+       (if (zerop (% year 4))
+           (calendar-gregorian-from-absolute
+             (1+ (calendar-dayname-on-or-before
+                   1 (+ 6 (calendar-absolute-from-gregorian
+                            (list 11 1 year)))))))
+       \"US Presidential Election\")
+
+or
+
+     (if (zerop (% displayed-year 4))
+         (holiday-fixed 11
+                (extract-calendar-day
+                 (calendar-gregorian-from-absolute
+                  (1+ (calendar-dayname-on-or-before
+                       1 (+ 6 (calendar-absolute-from-gregorian
+                               (list 11 1 displayed-year)))))))
+                \"US Presidential Election\"))
+
+to the list.  To include the phases of the moon, add
+
+     (lunar-phases)
+
+to the holiday list, where `lunar-phases' is an Emacs-Lisp function that
+you've written to return a (possibly empty) list of the relevant VISIBLE dates
+with descriptive strings such as
+
+     (((2 6 1989) \"New Moon\") ((2 12 1989) \"First Quarter Moon\") ... ).")
+
+(defconst calendar-buffer "*Calendar*"
+  "Name of the buffer used for the calendar.")
+
+(defconst holiday-buffer "*Holidays*"
+  "Name of the buffer used for the displaying the holidays.")
+
+(defconst fancy-diary-buffer "*Fancy Diary Entries*"
+  "Name of the buffer used for the optional fancy display of the diary.")
+
+(defconst lunar-phases-buffer "*Phases of Moon*"
+  "Name of the buffer used for the lunar phases.")
+
+(defmacro increment-calendar-month (mon yr n)
+  "Move the variables MON and YR to the month and year by N months.
+Forward if N is positive or backward if N is negative."
+  (` (let (( macro-y (+ (* (, yr) 12) (, mon) -1 (, n) )))
+       (setq (, mon) (1+ (% macro-y 12) ))
+       (setq (, yr) (/ macro-y 12)))))
+
+(defmacro calendar-for-loop (var from init to final do &rest body)
+  "Execute a for loop."
+  (` (let (( (, var) (1- (, init)) ))
+       (while (>= (, final) (setq (, var) (1+ (, var))))
+         (,@ body)))))
+
+(defmacro calendar-sum (index initial condition expression)
+  "For INDEX = INITIAL et seq, as long as CONDITION holds, sum EXPRESSION."
+  (` (let (( (, index) (, initial))
+             (sum 0))
+       (while (, condition)
+         (setq sum (+ sum (, expression) ))
+         (setq (, index) (1+ (, index))))
+       sum)))
+
+;; The following are in-line for speed; they can be called thousands of times
+;; when looking up holidays or processing the diary.  Here, for example, are
+;; the numbers of calls to calendar/diary/holiday functions in preparing the
+;; fancy diary display, for a moderately complex diary file, with functions
+;; used instead of macros.  There were a total of 10000 such calls:
+;;
+;;  1934   extract-calendar-month
+;;  1852   extract-calendar-year
+;;  1819   extract-calendar-day
+;;   845   calendar-leap-year-p
+;;   837   calendar-day-number
+;;   775   calendar-absolute-from-gregorian
+;;   346   calendar-last-day-of-month
+;;   286   hebrew-calendar-last-day-of-month
+;;   188   hebrew-calendar-leap-year-p
+;;   180   hebrew-calendar-elapsed-days
+;;   163   hebrew-calendar-last-month-of-year
+;;    66   calendar-date-compare
+;;    65   hebrew-calendar-days-in-year
+;;    60   calendar-absolute-from-julian
+;;    50   calendar-absolute-from-hebrew
+;;    43   calendar-date-equal
+;;    38   calendar-gregorian-from-absolute
+;;     .
+;;     .
+;;     .
+;;
+;; The use of these seven macros eliminates the overhead of 92% of the function
+;; calls; it's faster this way.
+
+(defsubst extract-calendar-month (date)
+  "Extract the month part of DATE which has the form (month day year)."
+  (car date))
+
+(defsubst extract-calendar-day (date)
+  "Extract the day part of DATE which has the form (month day year)."
+  (car (cdr date)))
+
+(defsubst extract-calendar-year (date)
+  "Extract the year part of DATE which has the form (month day year)."
+  (car (cdr (cdr date))))
+
+(defsubst calendar-leap-year-p (year)
+  "Returns t if YEAR is a Gregorian leap year."
+  (and (zerop (% year 4))
+       (or (not (zerop (% year 100)))
+           (zerop (% year 400)))))
+
+;; The foregoing is a bit faster, but not as clear as the following:
+;;
+;;(defsubst calendar-leap-year-p (year)
+;;  "Returns t if YEAR is a Gregorian leap year."
+;;  (or
+;;    (and (=  (% year   4) 0)
+;;         (/= (% year 100) 0))
+;;    (= (% year 400) 0)))
+
+(defsubst calendar-last-day-of-month (month year)
+  "The last day in MONTH during YEAR."
+  (if (and (= month 2) (calendar-leap-year-p year))
+      29
+    (aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
+
+;; An explanation of the calculation can be found in PascAlgorithms by
+;; Edward and Ruth Reingold, Scott-Foresman/Little, Brown, 1988.
+
+(defsubst calendar-day-number (date)
+  "Return the day number within the year of the date DATE.
+For example, (calendar-day-number '(1 1 1987)) returns the value 1,
+while (calendar-day-number '(12 31 1980)) returns 366."
+    (let* ((month (extract-calendar-month date))
+           (day (extract-calendar-day date))
+           (year (extract-calendar-year date))
+         (day-of-year (+ day (* 31 (1- month)))))
+      (if (> month 2)
+          (progn
+            (setq day-of-year (- day-of-year (/ (+ 23 (* 4 month)) 10)))
+            (if (calendar-leap-year-p year)
+                (setq day-of-year (1+ day-of-year)))))
+      day-of-year))
+
+(defsubst calendar-absolute-from-gregorian (date)
+  "The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
+The Gregorian date Sunday, December 31, 1 BC is imaginary."
+  (let ((prior-years (1- (extract-calendar-year date))))
+    (+ (calendar-day-number date);; Days this year
+       (* 365 prior-years);;        + Days in prior years
+       (/ prior-years 4);;          + Julian leap years
+       (- (/ prior-years 100));;    - century years
+       (/ prior-years 400))));;     + Gregorian leap years
+
+;;;###autoload
+(defun calendar (&optional arg)
+  "Display a three-month calendar in another window.
+The three months appear side by side, with the current month in the middle
+surrounded by the previous and next months.  The cursor is put on today's date.
+
+If called with an optional prefix argument, prompts for month and year.
+
+This function is suitable for execution in a .emacs file; appropriate setting
+of the variable `view-diary-entries-initially' will cause the diary entries for
+the current date to be displayed in another window.  The value of the variable
+`number-of-diary-entries' controls the number of days of diary entries
+displayed upon initial display of the calendar.
+
+An optional prefix argument ARG causes the calendar displayed to be ARG
+months in the future if ARG is positive or in the past if ARG is negative;
+in this case the cursor goes on the first day of the month.
+
+Once in the calendar window, future or past months can be moved into view.
+Arbitrary months can be displayed, or the calendar can be scrolled forward
+or backward.
+
+The cursor can be moved forward or backward by one day, one week, one month,
+or one year.  All of these commands take prefix arguments which, when negative,
+cause movement in the opposite direction.  For convenience, the digit keys
+and the minus sign are automatically prefixes.  The window is replotted as
+necessary to display the desired date.
+
+Diary entries can be marked on the calendar or displayed in another window.
+
+Use M-x describe-mode for details of the key bindings in the calendar window.
+
+The Gregorian calendar is assumed.
+
+After loading the calendar, the hooks given by the variable
+`calendar-load-hook' are run.  This is the place to add key bindings to the
+calendar-mode-map.
+
+After preparing the calendar window initially, the hooks given by the variable
+`initial-calendar-window-hook' are run.
+
+The hooks given by the variable `today-visible-calendar-hook' are run
+everytime the calendar window gets scrolled, if the current date is visible
+in the window.  If it is not visible, the hooks given by the variable
+`today-invisible-calendar-hook' are run.  Thus, for example, setting
+`today-visible-calendar-hook' to 'calendar-star-date will cause today's date
+to be replaced by asterisks to highlight it whenever it is in the window."
+  (interactive "P")
+  (set-buffer (get-buffer-create calendar-buffer))
+  (calendar-mode)
+  (let* ((pop-up-windows t)
+         (split-height-threshold 1000)
+         (date (if arg
+                   (calendar-read-date t)
+                 (calendar-current-date)))
+         (month (extract-calendar-month date))
+         (year (extract-calendar-year date)))
+    (pop-to-buffer calendar-buffer)
+    (increment-calendar-month month year (- calendar-offset))
+    (generate-calendar-window month year)
+    (if (and view-diary-entries-initially (calendar-date-is-visible-p date))
+        (view-diary-entries
+         (if (vectorp number-of-diary-entries)
+             (aref number-of-diary-entries (calendar-day-of-week date))
+           number-of-diary-entries))))
+  (let* ((diary-buffer (get-file-buffer diary-file))
+         (diary-window (if diary-buffer (get-buffer-window diary-buffer)))
+         (split-height-threshold (if diary-window 2 1000)))
+    (if view-calendar-holidays-initially
+        (list-calendar-holidays)))
+  (run-hooks 'initial-calendar-window-hook))
+
+(autoload 'view-diary-entries "diary-lib"
+  "Prepare and display a buffer with diary entries.
+Searches your diary file for entries that match ARG days starting with
+the date indicated by the cursor position in the displayed three-month
+calendar."
+  t)
+
+(autoload 'calendar-sunrise-sunset "solar"
+  "Local time of sunrise and sunset for date under cursor."
+  t)
+
+(autoload 'calendar-phases-of-moon "lunar"
+  "Create a buffer of the phases of the moon for the current calendar window."
+  t)
+
+(autoload 'calendar-print-french-date "cal-french"
+  "Show the French Revolutionary calendar equivalent of the date under the cursor."
+  t)
+
+(autoload 'calendar-goto-french-date "cal-french"
+ "Move cursor to French Revolutionary date."
+  t)
+
+(autoload 'calendar-french-date-string "cal-french"
+  "String of French Revolutionary date of Gregorian DATE."
+  t)
+
+(autoload 'calendar-mayan-date-string "cal-mayan"
+  "String of Mayan date of Gregorian DATE."
+  t)
+
+(autoload 'calendar-print-mayan-date "cal-mayan"
+  "Show the Mayan long count, Tzolkin, and Haab equivalents of the date under the cursor."
+  t)
+
+(autoload 'calendar-goto-mayan-long-count-date "cal-mayan"
+ "Move cursor to Mayan long count date."
+  t)
+
+(autoload 'calendar-next-haab-date "cal-mayan"
+  "Move cursor to next instance of Mayan Haab date."
+  t)
+
+(autoload 'calendar-previous-haab-date "cal-mayan"
+  "Move cursor to previous instance of Mayan Haab date."
+  t)
+
+(autoload 'calendar-next-tzolkin-date "cal-mayan"
+  "Move cursor to next instance of Mayan Tzolkin date."
+  t)
+
+(autoload 'calendar-previous-tzolkin-date "cal-mayan"
+  "Move cursor to previous instance of Mayan Tzolkin date."
+  t)
+
+(autoload 'calendar-next-calendar-round-date "cal-mayan"
+  "Move cursor to next instance of Mayan Haab/Tzoklin combination."
+  t)
+
+(autoload 'calendar-previous-calendar-round-date "cal-mayan"
+  "Move cursor to previous instance of Mayan Haab/Tzoklin combination."
+  t)
+
+(autoload 'show-all-diary-entries "diary-lib"
+  "Show all of the diary entries in the diary file.
+This function gets rid of the selective display of the diary file so that
+all entries, not just some, are visible.  If there is no diary buffer, one
+is created."
+  t)
+
+(autoload 'mark-diary-entries "diary-lib"
+  "Mark days in the calendar window that have diary entries.
+Each entry in diary file visible in the calendar window is marked."
+  t)
+
+(autoload 'insert-diary-entry "diary-ins"
+  "Insert a diary entry for the date indicated by point."
+  t)
+
+(autoload 'insert-weekly-diary-entry "diary-ins"
+  "Insert a weekly diary entry for the day of the week indicated by point."
+  t)
+
+
+(autoload 'insert-monthly-diary-entry "diary-ins"
+  "Insert a monthly diary entry for the day of the month indicated by point."
+  t)
+
+(autoload 'insert-yearly-diary-entry "diary-ins"
+  "Insert an annual diary entry for the day of the year indicated by point."
+  t)
+
+(autoload 'insert-anniversary-diary-entry "diary-ins"
+  "Insert an anniversary diary entry for the date indicated by point."
+  t)
+
+(autoload 'insert-block-diary-entry "diary-ins"
+  "Insert a block diary entry for the dates indicated by point and mark."
+  t)
+
+(autoload 'insert-cyclic-diary-entry "diary-ins"
+  "Insert a cyclic diary entry starting at the date indicated by point."
+  t)
+
+(autoload 'insert-hebrew-diary-entry "diary-ins"
+  "Insert a diary entry for the Hebrew date corresponding to the date
+indicated by point."
+  t)
+
+(autoload 'insert-monthly-hebrew-diary-entry "diary-ins"
+  "Insert a monthly diary entry for the day of the Hebrew month corresponding
+to the date indicated by point."
+  t)
+
+(autoload 'insert-yearly-hebrew-diary-entry "diary-ins"
+  "Insert an annual diary entry for the day of the Hebrew year corresponding
+to the date indicated by point."
+  t)
+
+(autoload 'insert-islamic-diary-entry "diary-ins"
+  "Insert a diary entry for the Islamic date corresponding to the date
+indicated by point."
+  t)
+
+(autoload 'insert-monthly-islamic-diary-entry "diary-ins"
+  "Insert a monthly diary entry for the day of the Islamic month corresponding
+to the date indicated by point."
+  t)
+
+(autoload 'insert-yearly-islamic-diary-entry "diary-ins"
+  "Insert an annual diary entry for the day of the Islamic year corresponding
+to the date indicated by point."
+  t)
+
+(autoload 'list-calendar-holidays "holidays"
+  "Create a buffer containing the holidays for the current calendar window.
+The holidays are those in the list `calendar-notable-days'.  Returns t if any
+holidays are found, nil if not."
+  t)
+
+(autoload 'mark-calendar-holidays "holidays"
+  "Mark notable days in the calendar window."
+  t)
+
+(autoload 'calendar-cursor-holidays "holidays"
+  "Find holidays for the date specified by the cursor in the calendar window."
+  t)
+
+(defun generate-calendar-window (&optional mon yr)
+  "Generate the calendar window for the current date.
+Or, for optional MON, YR."
+  (let* ((buffer-read-only nil)
+         (today (calendar-current-date))
+         (month (extract-calendar-month today))
+         (day (extract-calendar-day today))
+         (year (extract-calendar-year today))
+         (today-visible
+          (or (not mon)
+              (let ((offset (calendar-interval mon yr month year)))
+                (and (<= offset 1) (>= offset -1)))))
+         (day-in-week (calendar-day-of-week today)))
+    (update-calendar-mode-line)
+    (if mon
+        (generate-calendar mon yr)
+        (generate-calendar month year))
+    (calendar-cursor-to-visible-date
+     (if today-visible today (list displayed-month 1 displayed-year)))
+    (set-buffer-modified-p nil)
+    (or (one-window-p t)
+        (/= (frame-width) (window-width))
+        (shrink-window (- (window-height) 9)))
+    (sit-for 0)
+    (and mark-holidays-in-calendar
+         (mark-calendar-holidays)
+         (sit-for 0))
+    (unwind-protect
+        (if mark-diary-entries-in-calendar (mark-diary-entries))
+      (if today-visible
+          (run-hooks 'today-visible-calendar-hook)
+        (run-hooks 'today-invisible-calendar-hook)))))
+
+(defun generate-calendar (month year)
+  "Generate a three-month Gregorian calendar centered around MONTH, YEAR."
+  (if (< (+ month (* 12 (1- year))) 2)
+      (error "Months before February, 1 AD are not available."))
+  (setq displayed-month month)
+  (setq displayed-year year)
+  (erase-buffer)
+  (increment-calendar-month month year -1)
+  (calendar-for-loop i from 0 to 2 do
+       (generate-calendar-month month year (+ 5 (* 25 i)))
+       (increment-calendar-month month year 1)))
+
+(defun generate-calendar-month (month year indent)
+  "Produce a calendar for MONTH, YEAR on the Gregorian calendar.
+The calendar is inserted in the buffer starting at the line on which point
+is currently located, but indented INDENT spaces.  The indentation is done
+from the first character on the line and does not disturb the first INDENT
+characters on the line."
+  (let* ((blank-days;; at start of month
+          (mod
+           (- (calendar-day-of-week (list month 1 year))
+              calendar-week-start-day)
+           7))
+	 (last (calendar-last-day-of-month month year)))
+   (goto-char (point-min))
+   (calendar-insert-indented
+    (calendar-string-spread
+     (list "" (format "%s %d" (calendar-month-name month) year) "") ?  20)
+    indent t)
+   (calendar-insert-indented "" indent);; Go to proper spot
+   (calendar-for-loop i from 0 to 6 do
+      (insert (substring (aref calendar-day-name-array 
+                               (mod (+ calendar-week-start-day i) 7))
+                         0 2))
+      (insert " "))
+   (calendar-insert-indented "" 0 t);; Force onto following line
+   (calendar-insert-indented "" indent);; Go to proper spot
+   ;; Add blank days before the first of the month
+   (calendar-for-loop i from 1 to blank-days do (insert "   "))
+   ;; Put in the days of the month
+   (calendar-for-loop i from 1 to last do
+      (insert (format "%2d " i))
+      (put-text-property (- (point) (if (< i 10) 2 3)) (1- (point))
+			 'highlight t)
+      (and (zerop (mod (+ i blank-days) 7))
+           (/= i last)
+           (calendar-insert-indented "" 0 t)    ;; Force onto following line
+           (calendar-insert-indented "" indent)))));; Go to proper spot
+
+(defun calendar-insert-indented (string indent &optional newline)
+  "Insert STRING at column INDENT.
+If the optional parameter NEWLINE is t, leave point at start of next line,
+inserting a newline if there was no next line; otherwise, leave point after
+the inserted text.  Value is always t."
+  ;; Try to move to that column.
+  (move-to-column indent)
+  ;; If line is too short, indent out to that column.
+  (if (< (current-column) indent)
+      (indent-to indent))
+  (insert string)
+  ;; Advance to next line, if requested.
+  (if newline
+      (progn
+	(end-of-line)
+	(if (eobp)
+            (newline)
+	  (forward-line 1))))
+  t)
+
+(defun redraw-calendar ()
+  "Redraw the calendar display."
+  (interactive)
+  (let ((cursor-date (calendar-cursor-to-date)))
+    (generate-calendar-window displayed-month displayed-year)
+    (calendar-cursor-to-visible-date cursor-date)))
+
+(defvar calendar-debug-sexp nil
+  "*Turn debugging on when evaluating a sexp in the diary or holiday list.")
+
+(defvar calendar-mode-map nil)
+(if calendar-mode-map
+    nil
+  (setq calendar-mode-map (make-sparse-keymap))
+  (calendar-for-loop i from 0 to 9 do
+       (define-key calendar-mode-map (int-to-string i) 'digit-argument))
+  (let ((l (list 'narrow-to-region 'mark-word 'mark-sexp 'mark-paragraph
+                 'mark-defun 'mark-whole-buffer 'mark-page
+                 'downcase-region 'upcase-region 'kill-region
+                 'copy-region-as-kill 'capitalize-region 'write-region)))
+    (while l
+      (substitute-key-definition (car l) 'calendar-not-implemented
+				 calendar-mode-map)
+      (setq l (cdr l))))
+  (define-key calendar-mode-map "-"     'negative-argument)
+  (define-key calendar-mode-map "\C-x>" 'scroll-calendar-right)
+  (define-key calendar-mode-map '[prior] 'scroll-calendar-right-three-months)
+  (define-key calendar-mode-map "\M-v"   'scroll-calendar-right-three-months)
+  (define-key calendar-mode-map "\C-x<" 'scroll-calendar-left)
+  (define-key calendar-mode-map '[next]  'scroll-calendar-left-three-months)
+  (define-key calendar-mode-map "\C-v"  'scroll-calendar-left-three-months)
+  (define-key calendar-mode-map "\C-b"  'calendar-backward-day)
+  (define-key calendar-mode-map "\C-p"  'calendar-backward-week)
+  (define-key calendar-mode-map "\M-{"   'calendar-backward-month)
+  (define-key calendar-mode-map "\C-x[" 'calendar-backward-year)
+  (define-key calendar-mode-map "\C-f"  'calendar-forward-day)
+  (define-key calendar-mode-map "\C-n"  'calendar-forward-week)
+  (define-key calendar-mode-map '[left]  'calendar-backward-day)
+  (define-key calendar-mode-map '[up]    'calendar-backward-week)
+  (define-key calendar-mode-map '[right] 'calendar-forward-day)
+  (define-key calendar-mode-map '[down]  'calendar-forward-week)
+  (define-key calendar-mode-map "\M-}"   'calendar-forward-month)
+  (define-key calendar-mode-map "\C-x]" 'calendar-forward-year)
+  (define-key calendar-mode-map "\C-a"  'calendar-beginning-of-week)
+  (define-key calendar-mode-map "\C-e"  'calendar-end-of-week)
+  (define-key calendar-mode-map "\M-a"   'calendar-beginning-of-month)
+  (define-key calendar-mode-map "\M-e"   'calendar-end-of-month)
+  (define-key calendar-mode-map "\M-<"   'calendar-beginning-of-year)
+  (define-key calendar-mode-map "\M->"   'calendar-end-of-year)
+  (define-key calendar-mode-map "\C-@"  'calendar-set-mark)
+  ;; Many people are used to typing C-SPC and getting C-@.
+  (define-key calendar-mode-map "\C- " 'calendar-set-mark)
+  (define-key calendar-mode-map "\C-x\C-x" 'calendar-exchange-point-and-mark)
+  (define-key calendar-mode-map "\M-=" 'calendar-count-days-region)
+  (define-key calendar-mode-map "gd"  'calendar-goto-date)
+  (define-key calendar-mode-map "gj"  'calendar-goto-julian-date)
+  (define-key calendar-mode-map "ga"  'calendar-goto-astro-day-number)
+  (define-key calendar-mode-map "gh"  'calendar-goto-hebrew-date)
+  (define-key calendar-mode-map "gi"  'calendar-goto-islamic-date)
+  (define-key calendar-mode-map "gc"  'calendar-goto-iso-date)
+  (define-key calendar-mode-map "gf"  'calendar-goto-french-date)
+  (define-key calendar-mode-map "gml"  'calendar-goto-mayan-long-count-date)
+  (define-key calendar-mode-map "gmpc" 'calendar-previous-calendar-round-date)
+  (define-key calendar-mode-map "gmnc" 'calendar-next-calendar-round-date)
+  (define-key calendar-mode-map "gmph" 'calendar-previous-haab-date)
+  (define-key calendar-mode-map "gmnh" 'calendar-next-haab-date)
+  (define-key calendar-mode-map "gmpt" 'calendar-previous-tzolkin-date)
+  (define-key calendar-mode-map "gmnt" 'calendar-next-tzolkin-date)
+  (define-key calendar-mode-map "S"   'calendar-sunrise-sunset)
+  (define-key calendar-mode-map "M"   'calendar-phases-of-moon)
+  (define-key calendar-mode-map " "   'scroll-other-window)
+  (define-key calendar-mode-map "\C-c\C-l" 'redraw-calendar)
+  (define-key calendar-mode-map "."   'calendar-goto-today)
+  (define-key calendar-mode-map "o"   'calendar-other-month)
+  (define-key calendar-mode-map "q"   'exit-calendar)
+  (define-key calendar-mode-map "a"   'list-calendar-holidays)
+  (define-key calendar-mode-map "h"   'calendar-cursor-holidays)
+  (define-key calendar-mode-map "x"   'mark-calendar-holidays)
+  (define-key calendar-mode-map "u"   'calendar-unmark)
+  (define-key calendar-mode-map "m"   'mark-diary-entries)
+  (define-key calendar-mode-map "d"   'view-diary-entries)
+  (define-key calendar-mode-map "D"   'view-other-diary-entries)
+  (define-key calendar-mode-map "s"   'show-all-diary-entries)
+  (define-key calendar-mode-map "pd"  'calendar-print-day-of-year)
+  (define-key calendar-mode-map "pc"  'calendar-print-iso-date)
+  (define-key calendar-mode-map "pj"  'calendar-print-julian-date)
+  (define-key calendar-mode-map "pa"  'calendar-print-astro-day-number)
+  (define-key calendar-mode-map "ph"  'calendar-print-hebrew-date)
+  (define-key calendar-mode-map "pi"  'calendar-print-islamic-date)
+  (define-key calendar-mode-map "pf"  'calendar-print-french-date)
+  (define-key calendar-mode-map "pm"  'calendar-print-mayan-date)
+  (define-key calendar-mode-map "id"  'insert-diary-entry)
+  (define-key calendar-mode-map "iw"  'insert-weekly-diary-entry)
+  (define-key calendar-mode-map "im"  'insert-monthly-diary-entry)
+  (define-key calendar-mode-map "iy"  'insert-yearly-diary-entry)
+  (define-key calendar-mode-map "ia"  'insert-anniversary-diary-entry)
+  (define-key calendar-mode-map "ib"  'insert-block-diary-entry)
+  (define-key calendar-mode-map "ic"  'insert-cyclic-diary-entry)
+  (define-key calendar-mode-map "ihd" 'insert-hebrew-diary-entry)
+  (define-key calendar-mode-map "ihm" 'insert-monthly-hebrew-diary-entry)
+  (define-key calendar-mode-map "ihy" 'insert-yearly-hebrew-diary-entry)
+  (define-key calendar-mode-map "iid" 'insert-islamic-diary-entry)
+  (define-key calendar-mode-map "iim" 'insert-monthly-islamic-diary-entry)
+  (define-key calendar-mode-map "iiy" 'insert-yearly-islamic-diary-entry)
+  (define-key calendar-mode-map "?"   'calendar-goto-info-node))
+
+(defun describe-calendar-mode ()
+  "Create a help buffer with a brief description of the calendar-mode."
+  (interactive)
+  (with-output-to-temp-buffer "*Help*"
+    (princ
+     (format
+      "Calendar Mode:\nFor a complete description, type %s\n%s\n"
+      (substitute-command-keys
+       "\\<calendar-mode-map>\\[describe-mode] from within the calendar")
+      (substitute-command-keys "\\{calendar-mode-map}")))
+    (save-excursion
+      (set-buffer standard-output)
+      (help-mode))
+    (print-help-return-message)))
+
+;; Calendar mode is suitable only for specially formatted data.
+(put 'calendar-mode 'mode-class 'special)
+
+(defvar calendar-mode-line-format
+  (list
+   (substitute-command-keys "\\<calendar-mode-map>\\[scroll-calendar-left]")
+   "Calendar"
+   (substitute-command-keys "\\<calendar-mode-map>\\[calendar-goto-info-node] info/\\[calendar-other-month] other/\\[calendar-goto-today] today")
+   '(calendar-date-string (calendar-current-date) t)
+   (substitute-command-keys "\\<calendar-mode-map>\\[scroll-calendar-right]"))
+  "The mode line of the calendar buffer.")
+
+(defun calendar-goto-info-node ()
+  "Go to the info node for the calendar."
+  (interactive)
+  (require 'info)
+  (let ((where (Info-find-emacs-command-nodes 'calendar)))
+    (if (not where)
+        (error "Couldn't find documentation for the calendar.")
+      (save-window-excursion (info))
+      (pop-to-buffer "*info*")
+      (Info-find-node (car (car where)) (car (cdr (car where)))))))
+
+(defun calendar-mode ()
+  "A major mode for the calendar window.
+
+For a complete description, type \
+\\<calendar-mode-map>\\[calendar-goto-info-node] from within the calendar.
+
+\\<calendar-mode-map>\\{calendar-mode-map}"
+
+  (kill-all-local-variables)
+  (setq major-mode 'calendar-mode)
+  (setq mode-name "Calendar")
+  (use-local-map calendar-mode-map)
+  (setq buffer-read-only t)
+  (setq indent-tabs-mode nil)
+  (update-calendar-mode-line)
+  (if (and (string-match "XEmacs" emacs-version) current-menubar)
+      (progn
+	(require 'cal-xemacs)
+	(calendar-add-menus)
+	(make-variable-buffer-local 'scroll-on-clipped-lines)
+	(setq scroll-on-clipped-lines nil)))
+  (make-local-variable 'calendar-mark-ring)
+  (make-local-variable 'displayed-month);;  Month in middle of window.
+  (make-local-variable 'displayed-year));;  Year in middle of window.
+
+(defun calendar-string-spread (strings char length)
+  "Concatenate list of STRINGS separated with copies of CHAR to fill LENGTH
+There must be at least 2 strings.  The effect is like mapconcat but the
+separating pieces are as balanced as possible.  Each item of STRINGS is
+evaluated before concatenation so it can actually be an expression that
+evaluates to a string.  If LENGTH is too short, the STRINGS are just
+concatenated and the result truncated."
+;; The algorithm is based on equation (3.25) on page 85 of Concrete
+;; Mathematics by Ronald L. Graham, Donald E. Knuth, and Oren Patashnik,
+;; Addison-Wesley, Reading, MA, 1989
+  (let* ((strings (mapcar 'eval strings))
+         (n (- length (length (apply 'concat strings))))
+         (m (1- (length strings)))
+         (s (car strings))
+         (strings (cdr strings))
+         (i 0))
+    (while strings
+      (setq s (concat s
+                      (make-string (max 0 (/ (+ n i) m)) char)
+                      (car strings)))
+      (setq i (1+ i))
+      (setq strings (cdr strings)))
+    (substring s 0 length)))
+
+(defun update-calendar-mode-line ()
+  "Update the calendar mode line with the current date and date style."
+  (if (bufferp (get-buffer calendar-buffer))
+      (save-excursion
+        (set-buffer calendar-buffer)
+        (setq mode-line-format
+              (calendar-string-spread
+               calendar-mode-line-format ?  (frame-width))))))
+
+(defun calendar-window-list ()
+  "List of all calendar-related windows."
+  (let ((calendar-buffers (calendar-buffer-list))
+        list)
+    (walk-windows '(lambda (w)
+                     (if (memq (window-buffer w) calendar-buffers)
+                         (setq list (cons w list))))
+                  nil t)
+    list))
+
+(defun calendar-buffer-list ()
+  "List of all calendar-related buffers."
+  (let* ((diary-buffer (get-file-buffer diary-file))
+         (buffers (list "*Yahrzeits*" lunar-phases-buffer holiday-buffer
+                        fancy-diary-buffer diary-buffer calendar-buffer))
+         (buffer-list nil)
+         b)
+    (while buffers
+      (setq b (car buffers))
+      (setq b (cond ((stringp b) (get-buffer b))
+                    ((bufferp b) b)
+                    (t nil)))
+      (if b (setq buffer-list (cons b buffer-list)))
+      (setq buffers (cdr buffers)))
+    buffer-list))
+
+(defun exit-calendar ()
+  "Get out of the calendar window and hide it and related buffers."
+  (interactive)
+  (let* ((diary-buffer (get-file-buffer diary-file)))
+    (if (and diary-buffer (buffer-modified-p diary-buffer)
+	     (not
+	      (yes-or-no-p
+	       "Diary modified; do you really want to exit the calendar? ")))
+	(error)
+      ;; Need to do this multiple times because one time can replace some
+      ;; calendar-related buffers with other calendar-related buffers
+      (mapcar (lambda (x)
+                (mapcar 'calendar-hide-window (calendar-window-list)))
+              (calendar-window-list)))))
+
+(defun calendar-hide-window (window)
+  "Hide WINDOW if it is calendar-related."
+  (let ((buffer (if (window-live-p window) (window-buffer window))))
+    (if (memq buffer (calendar-buffer-list))
+        (cond
+         ((and window-system
+               (eq 'icon (cdr (assoc 'visibility
+                                     (frame-parameters
+                                      (window-frame window))))))
+          nil)
+         ((and window-system (window-dedicated-p window))
+          (iconify-frame (window-frame window)))
+         ((not (and (select-window window) (one-window-p window)))
+          (delete-window window))
+         (t (set-buffer buffer)
+            (bury-buffer))))))
+
+(defun calendar-goto-today ()
+  "Reposition the calendar window so the current date is visible."
+  (interactive)
+  (let ((today (calendar-current-date)));; The date might have changed.
+    (if (not (calendar-date-is-visible-p today))
+        (generate-calendar-window)
+      (update-calendar-mode-line)
+      (calendar-cursor-to-visible-date today))))
+
+(defun calendar-forward-month (arg)
+  "Move the cursor forward ARG months.
+Movement is backward if ARG is negative."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let* ((cursor-date (calendar-cursor-to-date t))
+         (month (extract-calendar-month cursor-date))
+         (day (extract-calendar-day cursor-date))
+         (year (extract-calendar-year cursor-date)))
+    (increment-calendar-month month year arg)
+    (let ((last (calendar-last-day-of-month month year)))
+      (if (< last day)
+        (setq day last)))
+    ;; Put the new month on the screen, if needed, and go to the new date.
+    (let ((new-cursor-date (list month day year)))
+      (if (not (calendar-date-is-visible-p new-cursor-date))
+          (calendar-other-month month year))
+      (calendar-cursor-to-visible-date new-cursor-date))))
+
+(defun calendar-forward-year (arg)
+  "Move the cursor forward by ARG years.
+Movement is backward if ARG is negative."
+  (interactive "p")
+  (calendar-forward-month (* 12 arg)))
+
+(defun calendar-backward-month (arg)
+  "Move the cursor backward by ARG months.
+Movement is forward if ARG is negative."
+  (interactive "p")
+  (calendar-forward-month (- arg)))
+
+(defun calendar-backward-year (arg)
+  "Move the cursor backward ARG years.
+Movement is forward is ARG is negative."
+  (interactive "p")
+  (calendar-forward-month (* -12 arg)))
+
+(defun scroll-calendar-left (arg)
+  "Scroll the displayed calendar left by ARG months.
+If ARG is negative the calendar is scrolled right.  Maintains the relative
+position of the cursor with respect to the calendar as well as possible."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let ((old-date (calendar-cursor-to-date))
+        (today (calendar-current-date)))
+    (if (/= arg 0)
+        (progn
+          (increment-calendar-month displayed-month displayed-year arg)
+          (generate-calendar-window displayed-month displayed-year)
+          (calendar-cursor-to-visible-date
+           (cond
+            ((calendar-date-is-visible-p old-date) old-date)
+            ((calendar-date-is-visible-p today) today)
+            (t (list displayed-month 1 displayed-year))))))))
+
+(defun scroll-calendar-right (arg)
+  "Scroll the displayed calendar window right by ARG months.
+If ARG is negative the calendar is scrolled left.  Maintains the relative
+position of the cursor with respect to the calendar as well as possible."
+  (interactive "p")
+  (scroll-calendar-left (- arg)))
+
+(defun scroll-calendar-left-three-months (arg)
+  "Scroll the displayed calendar window left by 3*ARG months.
+If ARG is negative the calendar is scrolled right.  Maintains the relative
+position of the cursor with respect to the calendar as well as possible."
+  (interactive "p")
+  (scroll-calendar-left (* 3 arg)))
+
+(defun scroll-calendar-right-three-months (arg)
+  "Scroll the displayed calendar window right by 3*ARG months.
+If ARG is negative the calendar is scrolled left.  Maintains the relative
+position of the cursor with respect to the calendar as well as possible."
+  (interactive "p")
+  (scroll-calendar-left (* -3 arg)))
+
+(defun calendar-current-date ()
+  "Returns the current date in a list (month day year)."
+  (let ((s (current-time-string)))
+    (list (length (member (substring s 4 7)
+                          '("Dec" "Nov" "Oct" "Sep" "Aug" "Jul"
+                            "Jun" "May" "Apr" "Mar" "Feb" "Jan")))
+          (string-to-number (substring s 8 10))
+          (string-to-number (substring s 20 24)))))
+
+(defun calendar-cursor-to-date (&optional error)
+  "Returns a list (month day year) of current cursor position.
+If cursor is not on a specific date, signals an error if optional parameter
+ERROR is t, otherwise just returns nil."
+  ;; #### This check is to avoid a race condition created by
+  ;; pop-to-buffer's call to other-window interacting with the 19.13
+  ;; changes allowing that to be in another frame.
+  (if (not (number-or-marker-p displayed-month))
+      nil
+    (let* ((segment (/ (current-column) 25))
+	   (month (% (+ displayed-month segment -1) 12))
+	   (month (if (= 0 month) 12 month))
+	   (year
+	    (cond
+	     ((and (=  12 month) (= segment 0)) (1- displayed-year))
+	     ((and (=   1 month) (= segment 2)) (1+ displayed-year))
+	     (t displayed-year))))
+      (if (and (looking-at "[0-9]")
+	       (< 2 (count-lines (point-min) (point))))
+	  (save-excursion
+	    (re-search-backward "[^0-9]")
+	    (list month
+		  (string-to-int (buffer-substring (1+ (point)) (+ 4 (point))))
+		  year))
+	(if (looking-at "\\*")
+	    (save-excursion
+	      (re-search-backward "[^*]")
+	      (if (looking-at ".\\*\\*")
+		  (list month calendar-starred-day year)
+		(if error (error "Not on a date!"))))
+	  (if error (error "Not on a date!")))))))
+
+(defun calendar-cursor-to-nearest-date ()
+  "Move the cursor to the closest date.
+The position of the cursor is unchanged if it is already on a date.
+Returns the list (month day year) giving the cursor position."
+  (let ((date (calendar-cursor-to-date))
+        (column (current-column)))
+    (if date
+        date
+      (if (> 3 (count-lines (point-min) (point)))
+          (progn
+            (goto-line 3)
+            (move-to-column column)))
+      (if (not (looking-at "[0-9]"))
+          (if (and (not (looking-at " *$"))
+                   (or (< column 25)
+                       (and (> column 27)
+                            (< column 50))
+                       (and (> column 52)
+                            (< column 75))))
+              (progn
+                (re-search-forward "[0-9]" nil t)
+                (backward-char 1))
+            (re-search-backward "[0-9]" nil t)))
+      (calendar-cursor-to-date))))
+
+(defun calendar-forward-day (arg)
+  "Move the cursor forward ARG days.
+Moves backward if ARG is negative."
+  (interactive "p")
+  (if (/= 0 arg)
+      (let*
+          ((cursor-date (calendar-cursor-to-date))
+           (cursor-date (if cursor-date
+                            cursor-date
+                          (if (> arg 0) (setq arg (1- arg)))
+                          (calendar-cursor-to-nearest-date)))
+           (new-cursor-date
+            (calendar-gregorian-from-absolute
+             (+ (calendar-absolute-from-gregorian cursor-date) arg)))
+           (new-display-month (extract-calendar-month new-cursor-date))
+           (new-display-year (extract-calendar-year new-cursor-date)))
+        ;; Put the new month on the screen, if needed, and go to the new date.
+        (if (not (calendar-date-is-visible-p new-cursor-date))
+            (calendar-other-month new-display-month new-display-year))
+        (calendar-cursor-to-visible-date new-cursor-date))))
+
+(defun calendar-backward-day (arg)
+  "Move the cursor back ARG days.
+Moves forward if ARG is negative."
+  (interactive "p")
+  (calendar-forward-day (- arg)))
+
+(defun calendar-forward-week (arg)
+  "Move the cursor forward ARG weeks.
+Moves backward if ARG is negative."
+  (interactive "p")
+  (calendar-forward-day (* arg 7)))
+
+(defun calendar-backward-week (arg)
+  "Move the cursor back ARG weeks.
+Moves forward if ARG is negative."
+  (interactive "p")
+  (calendar-forward-day (* arg -7)))
+
+(defun calendar-beginning-of-week (arg)
+  "Move the cursor back ARG calendar-week-start-day's."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let ((day (calendar-day-of-week (calendar-cursor-to-date))))
+    (calendar-backward-day
+     (if (= day calendar-week-start-day)
+         (* 7 arg)
+       (+ (mod (- day calendar-week-start-day) 7)
+          (* 7 (1- arg)))))))
+
+(defun calendar-end-of-week (arg)
+  "Move the cursor forward ARG calendar-week-start-day+6's."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let ((day (calendar-day-of-week (calendar-cursor-to-date))))
+    (calendar-forward-day
+     (if (= day (mod (1- calendar-week-start-day) 7))
+         (* 7 arg)
+       (+ (- 6 (mod (- day calendar-week-start-day) 7))
+          (* 7 (1- arg)))))))
+
+(defun calendar-beginning-of-month (arg)
+  "Move the cursor backward ARG month beginnings."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let* ((date (calendar-cursor-to-date))
+         (month (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date)))
+    (if (= day 1)
+        (calendar-backward-month arg)
+      (calendar-cursor-to-visible-date (list month 1 year))
+      (calendar-backward-month (1- arg)))))
+
+(defun calendar-end-of-month (arg)
+  "Move the cursor forward ARG month ends."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let* ((date (calendar-cursor-to-date))
+         (month (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date))
+         (last-day (calendar-last-day-of-month month year)))
+    (if (/= day last-day)
+        (progn
+          (calendar-cursor-to-visible-date (list month last-day year))
+          (setq arg (1- arg))))
+    (increment-calendar-month month year arg)
+    (let ((last-day (list
+                     month
+                     (calendar-last-day-of-month month year)
+                     year)))
+      (if (not (calendar-date-is-visible-p last-day))
+          (calendar-other-month month year)
+      (calendar-cursor-to-visible-date last-day)))))
+
+(defun calendar-beginning-of-year (arg)
+  "Move the cursor backward ARG year beginnings."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let* ((date (calendar-cursor-to-date))
+         (month (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date))
+         (jan-first (list 1 1 year)))
+    (if (and (= day 1) (= 1 month))
+        (calendar-backward-month (* 12 arg))
+      (if (and (= arg 1)
+               (calendar-date-is-visible-p jan-first))
+          (calendar-cursor-to-visible-date jan-first)
+        (calendar-other-month 1 (- year (1- arg)))))))
+
+(defun calendar-end-of-year (arg)
+  "Move the cursor forward ARG year beginnings."
+  (interactive "p")
+  (calendar-cursor-to-nearest-date)
+  (let* ((date (calendar-cursor-to-date))
+         (month (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date))
+         (dec-31 (list 12 31 year)))
+    (if (and (= day 31) (= 12 month))
+        (calendar-forward-month (* 12 arg))
+      (if (and (= arg 1)
+               (calendar-date-is-visible-p dec-31))
+          (calendar-cursor-to-visible-date dec-31)
+        (calendar-other-month 12 (- year (1- arg)))
+        (calendar-cursor-to-visible-date (list 12 31 displayed-year))))))
+
+;; The following version of calendar-gregorian-from-absolute is preferred for
+;; reasons of clarity, BUT it's much slower than the version that follows it.
+
+;;(defun calendar-gregorian-from-absolute (date)
+;;  "Compute the list (month day year) corresponding to the absolute DATE.
+;;The absolute date is the number of days elapsed since the (imaginary)
+;;Gregorian date Sunday, December 31, 1 BC."
+;;  (let* ((approx (/ date 366));; Approximation from below.
+;;         (year                ;; Search forward from the approximation.
+;;          (+ approx
+;;             (calendar-sum y approx
+;;                 (>= date (calendar-absolute-from-gregorian (list 1 1 (1+ y))))
+;;                  1)))
+;;         (month         ;; Search forward from January.
+;;          (1+ (calendar-sum m 1
+;;                   (> date
+;;                      (calendar-absolute-from-gregorian
+;;                       (list m (calendar-last-day-of-month m year) year)))
+;;                   1)))
+;;         (day           ;; Calculate the day by subtraction.
+;;          (- date
+;;             (1- (calendar-absolute-from-gregorian (list month 1 year))))))
+;;    (list month day year)))
+
+(defun calendar-gregorian-from-absolute (date)
+  "Compute the list (month day year) corresponding to the absolute DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+;; See the footnote on page 384 of ``Calendrical Calculations, Part II:
+;; Three Historical Calendars'' by E. M. Reingold,  N. Dershowitz, and S. M.
+;; Clamen, Software--Practice and Experience, Volume 23, Number 4
+;; (April, 1993), pages 383-404 for an explanation.
+  (let* ((d0 (1- date))
+         (n400 (/ d0 146097))
+         (d1 (% d0 146097))
+         (n100 (/ d1 36524))
+         (d2 (% d1 36524))
+         (n4 (/ d2 1461))
+         (d3 (% d2 1461))
+         (n1 (/ d3 365))
+         (day (1+ (% d3 365)))
+         (year (+ (* 400 n400) (* 100 n100) (* n4 4) n1)))
+    (if (or (= n100 4) (= n1 4))
+        (list 12 31 year)
+      (let ((year (1+ year))
+            (month 1))
+        (while (let ((mdays (calendar-last-day-of-month month year)))
+                 (and (< mdays day)
+                      (setq day (- day mdays))))
+          (setq month (1+ month)))
+        (list month day year)))))
+
+(defun calendar-cursor-to-visible-date (date)
+  "Move the cursor to DATE that is on the screen."
+  (let* ((month (extract-calendar-month date))
+	 (day (extract-calendar-day date))
+	 (year (extract-calendar-year date))
+	 (first-of-month-weekday (calendar-day-of-week (list month 1 year))))
+    (goto-line (+ 3
+		  (/ (+ day  -1
+                        (mod
+                         (- (calendar-day-of-week (list month 1 year))
+                            calendar-week-start-day)
+                         7))
+                     7)))
+    (move-to-column (+ 6
+		       (* 25
+			  (1+ (calendar-interval
+			       displayed-month displayed-year month year)))
+		       (* 3 (mod
+                             (- (calendar-day-of-week date)
+                                calendar-week-start-day)
+                             7))))))
+
+(defun calendar-other-month (month year)
+  "Display a three-month calendar centered around MONTH and YEAR."
+  (interactive (calendar-read-date 'noday))
+  (if (and (= month displayed-month)
+           (= year displayed-year))
+      nil
+    (let ((old-date (calendar-cursor-to-date))
+          (today (calendar-current-date)))
+      (generate-calendar-window month year)
+      (calendar-cursor-to-visible-date
+       (cond
+        ((calendar-date-is-visible-p old-date) old-date)
+        ((calendar-date-is-visible-p today) today)
+        (t (list month 1 year)))))))
+
+(defun calendar-set-mark (arg)
+  "Mark the date under the cursor, or jump to marked date.
+With no prefix argument, push current date onto marked date ring.
+With argument, jump to mark, pop it, and put point at end of ring."
+  (interactive "P")
+  (let ((date (calendar-cursor-to-date t)))
+    (if (null arg)
+        (progn
+          (setq calendar-mark-ring (cons date calendar-mark-ring))
+          ;; Since the top of the mark ring is the marked date in the
+          ;; calendar, the mark ring in the calendar is one longer than
+          ;; in other buffers to get the same effect.
+          (if (> (length calendar-mark-ring) (1+ mark-ring-max))
+              (setcdr (nthcdr mark-ring-max calendar-mark-ring) nil))
+          (message "Mark set"))
+      (if (null calendar-mark-ring)
+          (error "No mark set in this buffer")
+        (calendar-goto-date (car calendar-mark-ring))
+        (setq calendar-mark-ring
+              (cdr (nconc calendar-mark-ring (list date))))))))
+
+(defun calendar-exchange-point-and-mark ()
+  "Exchange the current cursor position with the marked date."
+  (interactive)
+  (let ((mark (car calendar-mark-ring))
+        (date (calendar-cursor-to-date t)))
+    (if (null mark)
+        (error "No mark set in this buffer")
+      (setq calendar-mark-ring (cons date (cdr calendar-mark-ring)))
+      (calendar-goto-date mark))))
+
+(defun calendar-count-days-region ()
+  "Count the number of days (inclusive) between point and the mark."
+  (interactive)
+  (let* ((days (- (calendar-absolute-from-gregorian
+                   (calendar-cursor-to-date t))
+                  (calendar-absolute-from-gregorian
+                   (or (car calendar-mark-ring)
+                       (error "No mark set in this buffer")))))
+         (days (1+ (if (> days 0) days (- days)))))
+    (message "Region has %d day%s (inclusive)"
+             days (if (> days 1) "s" ""))))
+
+(defun calendar-not-implemented ()
+  "Not implemented."
+  (interactive)
+  (error "%s not available in the calendar"
+         (global-key-binding (this-command-keys))))
+
+(defun calendar-read (prompt acceptable &optional initial-contents)
+  "Return an object read from the minibuffer.
+Prompt with the string PROMPT and use the function ACCEPTABLE to decide if
+entered item is acceptable.  If non-nil, optional third arg INITIAL-CONTENTS
+is a string to insert in the minibuffer before reading."
+  (let ((value (read-minibuffer prompt initial-contents)))
+    (while (not (funcall acceptable value))
+      (setq value (read-minibuffer prompt initial-contents)))
+    value))
+
+(defun calendar-read-date (&optional noday)
+  "Prompt for Gregorian date.  Returns a list (month day year).
+If optional NODAY is t, does not ask for day, but just returns
+(month nil year); if NODAY is any other non-nil value the value returned is
+(month year) "
+  (let* ((year (calendar-read
+                "Year (>0): "
+                '(lambda (x) (> x 0))
+                (int-to-string (extract-calendar-year
+                                (calendar-current-date)))))
+         (month-array calendar-month-name-array)
+         (completion-ignore-case t)
+         (month (cdr (assoc
+                      (capitalize
+                       (completing-read
+                        "Month name: "
+                        (mapcar 'list (append month-array nil))
+                        nil t))
+                      (calendar-make-alist month-array 1 'capitalize))))
+         (last (calendar-last-day-of-month month year)))
+    (if noday
+        (if (eq noday t)
+            (list month nil year)
+          (list month year))
+      (list month
+            (calendar-read (format "Day (1-%d): " last)
+                                   '(lambda (x) (and (< 0 x) (<= x last))))
+            year))))
+
+(defun calendar-goto-date (date)
+  "Move cursor to DATE."
+  (interactive (list (calendar-read-date)))
+  (let ((month (extract-calendar-month date))
+        (year (extract-calendar-year date)))
+    (if (not (calendar-date-is-visible-p date))
+        (calendar-other-month
+         (if (and (= month 1) (= year 1))
+             2
+           month)
+         year)))
+  (calendar-cursor-to-visible-date date))
+
+(defun calendar-goto-julian-date (date &optional noecho)
+  "Move cursor to Julian DATE; echo Julian date unless NOECHO is t."
+  (interactive
+   (let* ((today (calendar-current-date))
+          (year (calendar-read
+                 "Julian calendar year (>0): "
+                 '(lambda (x) (> x 0))
+                 (int-to-string
+                  (extract-calendar-year
+                   (calendar-julian-from-absolute
+                    (calendar-absolute-from-gregorian
+                     today))))))
+          (month-array calendar-month-name-array)
+          (completion-ignore-case t)
+          (month (cdr (assoc
+                       (capitalize
+                        (completing-read
+                         "Julian calendar month name: "
+                         (mapcar 'list (append month-array nil))
+                         nil t))
+                       (calendar-make-alist month-array 1 'capitalize))))
+          (last 
+           (if (and (zerop (% year 4)) (= month 2))
+               29
+             (aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
+          (day (calendar-read
+                (format "Julian calendar day (%d-%d): "
+                        (if (and (= year 1) (= month 1)) 3 1) last)
+                '(lambda (x) 
+                   (and (< (if (and (= year 1) (= month 1)) 2 0) x)
+                        (<= x last))))))
+     (list (list month day year))))
+  (calendar-goto-date (calendar-gregorian-from-absolute
+                       (calendar-absolute-from-julian date)))
+  (or noecho (calendar-print-julian-date)))
+
+(defun calendar-goto-hebrew-date (date &optional noecho)
+  "Move cursor to Hebrew DATE; echo Hebrew date unless NOECHO is t."
+  (interactive
+   (let* ((today (calendar-current-date))
+          (year (calendar-read
+                 "Hebrew calendar year (>3760): "
+                 '(lambda (x) (> x 3760))
+                 (int-to-string
+                  (extract-calendar-year
+                   (calendar-hebrew-from-absolute
+                    (calendar-absolute-from-gregorian today))))))
+          (month-array (if (hebrew-calendar-leap-year-p year)
+                           calendar-hebrew-month-name-array-leap-year
+                         calendar-hebrew-month-name-array-common-year))
+          (completion-ignore-case t)
+          (month (cdr (assoc
+                       (capitalize
+                        (completing-read
+                         "Hebrew calendar month name: "
+                         (mapcar 'list (append month-array nil))
+                         (if (= year 3761)
+                             '(lambda (x)
+                                (let ((m (cdr
+                                          (assoc
+                                           (car x)
+                                           (calendar-make-alist
+                                            month-array)))))
+                                  (< 0
+                                     (calendar-absolute-from-hebrew
+                                      (list m
+                                            (hebrew-calendar-last-day-of-month
+                                             m year)
+                                            year))))))
+                                 
+                         t))
+                       (calendar-make-alist month-array 1 'capitalize))))
+          (last (hebrew-calendar-last-day-of-month month year))
+          (first (if (and (= year 3761) (= month 10))
+                     18 1))
+          (day (calendar-read
+                (format "Hebrew calendar day (%d-%d): "
+                        first last)
+                '(lambda (x) (and (<= first x) (<= x last))))))
+     (list (list month day year))))
+  (calendar-goto-date (calendar-gregorian-from-absolute
+                       (calendar-absolute-from-hebrew date)))
+  (or noecho (calendar-print-hebrew-date)))
+
+(defun calendar-goto-islamic-date (date &optional noecho)
+  "Move cursor to Islamic DATE; echo Islamic date unless NOECHO is t."
+  (interactive
+   (let* ((today (calendar-current-date))
+          (year (calendar-read
+                 "Islamic calendar year (>0): "
+                 '(lambda (x) (> x 0))
+                 (int-to-string
+                  (extract-calendar-year
+                   (calendar-islamic-from-absolute
+                    (calendar-absolute-from-gregorian today))))))
+          (month-array calendar-islamic-month-name-array)
+          (completion-ignore-case t)
+          (month (cdr (assoc
+                       (capitalize
+                        (completing-read
+                         "Islamic calendar month name: "
+                         (mapcar 'list (append month-array nil))
+                         nil t))
+                       (calendar-make-alist month-array 1 'capitalize))))
+          (last (islamic-calendar-last-day-of-month month year))
+          (day (calendar-read
+                (format "Islamic calendar day (1-%d): " last)
+                '(lambda (x) (and (< 0 x) (<= x last))))))
+     (list (list month day year))))
+  (calendar-goto-date (calendar-gregorian-from-absolute
+                       (calendar-absolute-from-islamic date)))
+  (or noecho (calendar-print-islamic-date)))
+
+(defun calendar-goto-iso-date (date &optional noecho)
+  "Move cursor to ISO DATE; echo ISO date unless NOECHO is t."
+  (interactive
+   (let* ((today (calendar-current-date))
+          (year (calendar-read
+                 "ISO calendar year (>0): "
+                 '(lambda (x) (> x 0))
+                 (int-to-string (extract-calendar-year today))))
+          (no-weeks (extract-calendar-month
+                     (calendar-iso-from-absolute
+                      (1-
+                       (calendar-dayname-on-or-before
+                        1 (calendar-absolute-from-gregorian
+                           (list 1 4 (1+ year))))))))
+          (week (calendar-read
+                 (format "ISO calendar week (1-%d): " no-weeks)
+                 '(lambda (x) (and (> x 0) (<= x no-weeks)))))
+          (day (calendar-read
+                "ISO day (1-7): "
+                '(lambda (x) (and (<= 1 x) (<= x 7))))))
+     (list (list week day year))))
+  (calendar-goto-date (calendar-gregorian-from-absolute
+                       (calendar-absolute-from-iso date)))
+  (or noecho (calendar-print-iso-date)))
+
+(defun calendar-interval (mon1 yr1 mon2 yr2)
+  "The number of months difference between MON1, YR1 and MON2, YR2."
+  (+ (* 12 (- yr2 yr1))
+     (- mon2 mon1)))
+
+(defun calendar-day-name (date)
+  "Returns a string with the name of the day of the week of DATE."
+  (aref calendar-day-name-array (calendar-day-of-week date)))
+
+(defvar calendar-day-name-array
+  ["Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday"])
+
+(defvar calendar-month-name-array
+  ["January" "February" "March"     "April"   "May"      "June"
+   "July"    "August"   "September" "October" "November" "December"])
+
+(defun calendar-make-alist (sequence &optional start-index filter)
+  "Make an assoc list corresponding to SEQUENCE.
+Start at index 1, unless optional START-INDEX is provided.
+If FILTER is provided, apply it to each item in the list."
+  (let ((index (if start-index (1- start-index) 0)))
+    (mapcar
+     '(lambda (x)
+        (setq index (1+ index))
+        (cons (if filter (funcall filter x) x)
+              index))
+     (append sequence nil))))
+
+(defun calendar-month-name (month)
+  "The name of MONTH."
+  (aref calendar-month-name-array (1- month)))
+
+(defun calendar-day-of-week (date)
+  "Returns the day-of-the-week index of DATE, 0 for Sunday, 1 for Monday, etc."
+  (% (calendar-absolute-from-gregorian date) 7))
+
+(defun calendar-unmark ()
+  "Delete all diary/holiday marks/highlighting from the calendar."
+  (interactive)
+  (setq mark-holidays-in-calendar nil)
+  (setq mark-diary-entries-in-calendar nil)
+  (redraw-calendar))
+
+(defun calendar-date-is-visible-p (date)
+  "Returns t if DATE is legal and is visible in the calendar window."
+  (let ((gap (calendar-interval
+              displayed-month displayed-year
+              (extract-calendar-month date) (extract-calendar-year date))))
+    (and (calendar-date-is-legal-p date) (> 2 gap) (< -2 gap))))
+
+(defun calendar-date-is-legal-p (date)
+  "Returns t if DATE is a legal date."
+  (let ((month (extract-calendar-month date))
+        (day (extract-calendar-day date))
+        (year (extract-calendar-year date)))
+    (and (<= 1 month) (<= month 12)
+         (<= 1 day) (<= day (calendar-last-day-of-month month year))
+         (<= 1 year))))
+
+(defun calendar-date-equal (date1 date2)
+  "Returns t if the DATE1 and DATE2 are the same."
+  (and
+   (= (extract-calendar-month date1) (extract-calendar-month date2))
+   (= (extract-calendar-day date1) (extract-calendar-day date2))
+   (= (extract-calendar-year date1) (extract-calendar-year date2))))
+
+(defun mark-visible-calendar-date (date &optional mark)
+  "Mark DATE in the calendar window with MARK.
+MARK is either a single-character string or a face.
+MARK defaults to diary-entry-marker."
+  (if (calendar-date-is-legal-p date)
+      (save-excursion
+        (set-buffer calendar-buffer)
+        (calendar-cursor-to-visible-date date)
+        (let ((mark (or mark diary-entry-marker)))
+          (if (stringp mark)
+              (let ((buffer-read-only nil))
+                (forward-char 1)
+                (delete-char 1)
+                (insert mark)
+                (forward-char -2))
+
+	    (set-extent-property (make-extent (1- (point)) (1+ (point)))
+				 'face mark))))))
+
+(defun calendar-star-date ()
+  "Replace the date under the cursor in the calendar window with asterisks.
+This function can be used with the today-visible-calendar-hook run after the
+calendar window has been prepared."
+  (let ((buffer-read-only nil))
+    (make-variable-buffer-local 'calendar-starred-day)
+    (forward-char 1)
+    (setq calendar-starred-day
+          (string-to-int
+           (buffer-substring (point) (- (point) 2))))
+    (delete-char -2)
+    (insert "**")
+    (backward-char 1)
+    (set-buffer-modified-p nil)))
+
+(defun calendar-mark-today ()
+  "Mark the date under the cursor in the calendar window.
+The date is marked with calendar-today-marker.  This function can be used with
+the today-visible-calendar-hook run after the calendar window has been
+prepared."
+  (mark-visible-calendar-date
+   (calendar-cursor-to-date)
+   calendar-today-marker))
+
+(defun calendar-date-compare (date1 date2)
+  "Returns t if DATE1 is before DATE2, nil otherwise.
+The actual dates are in the car of DATE1 and DATE2."
+  (< (calendar-absolute-from-gregorian (car date1))
+     (calendar-absolute-from-gregorian (car date2))))
+
+(defun calendar-date-string (date &optional abbreviate nodayname)
+  "A string form of DATE, driven by the variable `calendar-date-display-form'.
+An optional parameter ABBREVIATE, when t, causes the month and day names to be
+abbreviated to three characters.  An optional parameter NODAYNAME, when t,
+omits the name of the day of the week."
+  (let* ((dayname
+          (if nodayname
+              nil
+            (if abbreviate
+                (substring (calendar-day-name date) 0 3)
+              (calendar-day-name date))))
+         (month (extract-calendar-month date))
+         (monthname
+          (if abbreviate
+              (substring
+               (calendar-month-name month) 0 3)
+            (calendar-month-name month)))
+         (day (int-to-string (extract-calendar-day date)))
+         (month (int-to-string month))
+         (year (int-to-string (extract-calendar-year date))))
+    (mapconcat 'eval calendar-date-display-form "")))
+
+(defun calendar-dayname-on-or-before (dayname date)
+  "Returns the absolute date of the DAYNAME on or before absolute DATE.
+DAYNAME=0 means Sunday, DAYNAME=1 means Monday, and so on.
+
+Note: Applying this function to d+6 gives us the DAYNAME on or after an
+absolute day d.  Similarly, applying it to d+3 gives the DAYNAME nearest to
+absolute date d, applying it to d-1 gives the DAYNAME previous to absolute
+date d, and applying it to d+7 gives the DAYNAME following absolute date d."
+  (- date (% (- date dayname) 7)))
+
+(defun calendar-nth-named-absday (n dayname month year &optional day)
+  "The absolute date of Nth DAYNAME in MONTH, YEAR before/after optional DAY.
+A DAYNAME of 0 means Sunday, 1 means Monday, and so on.  If N<0,
+return the Nth DAYNAME before MONTH DAY, YEAR (inclusive).
+If N>0, return the Nth DAYNAME after MONTH DAY, YEAR (inclusive).
+
+If DAY is omitted, it defaults to 1 if N>0, and MONTH's last day otherwise."
+  (if (> n 0)
+      (+ (* 7 (1- n))
+	 (calendar-dayname-on-or-before
+	  dayname
+	  (+ 6 (calendar-absolute-from-gregorian
+		(list month (or day 1) year)))))
+    (+ (* 7 (1+ n))
+       (calendar-dayname-on-or-before
+	dayname
+	(calendar-absolute-from-gregorian
+	 (list month
+	       (or day (calendar-last-day-of-month month year))
+	       year))))))
+
+(defun calendar-nth-named-day (n dayname month year &optional day)
+  "The date of Nth DAYNAME in MONTH, YEAR before/after optional DAY.
+A DAYNAME of 0 means Sunday, 1 means Monday, and so on.  If N<0,
+return the Nth DAYNAME before MONTH DAY, YEAR (inclusive).
+If N>0, return the Nth DAYNAME after MONTH DAY, YEAR (inclusive).
+
+If DAY is omitted, it defaults to 1 if N>0, and MONTH's last day otherwise."
+  (calendar-gregorian-from-absolute
+   (calendar-nth-named-absday n dayname month year day)))
+
+(defun calendar-day-of-year-string (&optional date)
+  "String of day number of year of Gregorian DATE.
+Defaults to today's date if DATE is not given."
+  (let* ((d (or date (calendar-current-date)))
+         (year (extract-calendar-year d))
+         (day (calendar-day-number d))
+         (days-remaining (- (calendar-day-number (list 12 31 year)) day)))
+    (format "Day %d of %d; %d day%s remaining in the year"
+            day year days-remaining (if (= days-remaining 1) "" "s"))))
+
+(defun calendar-print-day-of-year ()
+  "Show day number in year/days remaining in year for date under the cursor."
+  (interactive)
+  (message (calendar-day-of-year-string (calendar-cursor-to-date t))))
+
+(defun calendar-absolute-from-iso (date)
+  "The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
+The `ISO year' corresponds approximately to the Gregorian year, but
+weeks start on Monday and end on Sunday.  The first week of the ISO year is
+the first such week in which at least 4 days are in a year.  The ISO
+commercial DATE has the form (week day year) in which week is in the range
+1..52 and day is in the range 0..6 (1 = Monday, 2 = Tuesday, ..., 0 =
+Sunday).  The Gregorian date Sunday, December 31, 1 BC is imaginary."
+  (let* ((week (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date)))
+    (+ (calendar-dayname-on-or-before
+        1 (+ 3 (calendar-absolute-from-gregorian (list 1 1 year))))
+       (* 7 (1- week))
+       (if (= day 0) 6 (1- day)))))
+
+(defun calendar-iso-from-absolute (date)
+  "Compute the `ISO commercial date' corresponding to the absolute DATE.
+The ISO year corresponds approximately to the Gregorian year, but weeks
+start on Monday and end on Sunday.  The first week of the ISO year is the
+first such week in which at least 4 days are in a year.  The ISO commercial
+date has the form (week day year) in which week is in the range 1..52 and
+day is in the range 0..6 (1 = Monday, 2 = Tuesday, ..., 0 = Sunday).  The
+absolute date is the number of days elapsed since the (imaginary) Gregorian
+date Sunday, December 31, 1 BC."
+  (let* ((approx (extract-calendar-year
+                  (calendar-gregorian-from-absolute (- date 3))))
+         (year (+ approx
+                  (calendar-sum y approx
+                      (>= date (calendar-absolute-from-iso (list 1 1 (1+ y))))
+                      1))))
+    (list
+     (1+ (/ (- date (calendar-absolute-from-iso (list 1 1 year))) 7))
+     (% date 7)
+     year)))
+
+(defun calendar-iso-date-string (&optional date)
+  "String of ISO date of Gregorian DATE.
+Defaults to today's date if DATE is not given."
+  (let* ((d (calendar-absolute-from-gregorian 
+             (or date (calendar-current-date))))
+         (day (% d 7))
+         (iso-date (calendar-iso-from-absolute d)))
+    (format "Day %s of week %d of %d"
+            (if (zerop day) 7 day)
+            (extract-calendar-month iso-date)
+            (extract-calendar-year iso-date))))
+
+(defun calendar-print-iso-date ()
+  "Show equivalent ISO date for the date under the cursor."
+  (interactive)
+  (message "ISO date: %s"
+           (calendar-iso-date-string (calendar-cursor-to-date t))))
+
+(defun calendar-julian-from-absolute (date)
+  "Compute the Julian (month day year) corresponding to the absolute DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+  (let* ((approx (/ (+ date 2) 366));; Approximation from below.
+         (year        ;; Search forward from the approximation.
+          (+ approx
+             (calendar-sum y approx
+                (>= date (calendar-absolute-from-julian (list 1 1 (1+ y))))
+                1)))
+         (month       ;; Search forward from January.
+          (1+ (calendar-sum m 1
+                 (> date
+                    (calendar-absolute-from-julian
+                     (list m
+                           (if (and (= m 2) (= (% year 4) 0))
+                               29
+                             (aref [31 28 31 30 31 30 31 31 30 31 30 31]
+                                   (1- m)))
+                           year)))
+                 1)))
+         (day         ;; Calculate the day by subtraction.
+          (- date (1- (calendar-absolute-from-julian (list month 1 year))))))
+    (list month day year)))
+
+(defun calendar-absolute-from-julian (date)
+  "The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
+The Gregorian date Sunday, December 31, 1 BC is imaginary."
+  (let ((month (extract-calendar-month date))
+        (day (extract-calendar-day date))
+        (year (extract-calendar-year date)))
+    (+ (calendar-day-number date)
+       (if (and (= (% year 100) 0)
+                (/= (% year 400) 0)
+                (> month 2))
+           1 0);; Correct for Julian but not Gregorian leap year.
+       (* 365 (1- year))
+       (/ (1- year) 4)
+       -2)))
+
+(defun calendar-julian-date-string (&optional date)
+  "String of Julian date of Gregorian DATE.
+Defaults to today's date if DATE is not given.
+Driven by the variable `calendar-date-display-form'."
+  (calendar-date-string
+   (calendar-julian-from-absolute
+    (calendar-absolute-from-gregorian
+     (or date (calendar-current-date))))
+   nil t))
+
+(defun calendar-print-julian-date ()
+  "Show the Julian calendar equivalent of the date under the cursor."
+  (interactive)
+  (message "Julian date: %s"
+           (calendar-julian-date-string (calendar-cursor-to-date t))))
+
+(defun islamic-calendar-leap-year-p (year)
+  "Returns t if YEAR is a leap year on the Islamic calendar."
+  (memq (% year 30)
+        (list 2 5 7 10 13 16 18 21 24 26 29)))
+
+(defun islamic-calendar-last-day-of-month (month year)
+  "The last day in MONTH during YEAR on the Islamic calendar."
+  (cond
+   ((memq month (list 1 3 5 7 9 11)) 30)
+   ((memq month (list 2 4 6 8 10)) 29)
+   (t (if (islamic-calendar-leap-year-p year) 30 29))))
+
+(defun islamic-calendar-day-number (date)
+  "Return the day number within the year of the Islamic date DATE."
+    (let* ((month (extract-calendar-month date))
+           (day (extract-calendar-day date)))
+      (+ (* 30 (/ month 2))
+         (* 29 (/ (1- month) 2))
+         day)))
+
+(defun calendar-absolute-from-islamic (date)
+  "Absolute date of Islamic DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+  (let* ((month (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date))
+         (y (% year 30))
+         (leap-years-in-cycle
+          (cond
+           ((< y 3) 0)  ((< y 6) 1)  ((< y 8) 2)  ((< y 11) 3) ((< y 14) 4)
+           ((< y 17) 5) ((< y 19) 6) ((< y 22) 7) ((< y 25) 8) ((< y 27) 9)
+           (t 10))))
+    (+ (islamic-calendar-day-number date);; days so far this year
+       (* (1- year) 354)                 ;; days in all non-leap years
+       (* 11 (/ year 30))                ;; leap days in complete cycles
+       leap-years-in-cycle               ;; leap days this cycle
+       227014)))                         ;; days before start of calendar
+
+(defun calendar-islamic-from-absolute (date)
+  "Compute the Islamic date (month day year) corresponding to absolute DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+  (if (< date 227015)
+      (list 0 0 0);; pre-Islamic date
+    (let* ((approx (/ (- date 227014) 355));; Approximation from below.
+           (year           ;; Search forward from the approximation.
+            (+ approx
+               (calendar-sum y approx
+                             (>= date (calendar-absolute-from-islamic
+                                       (list 1 1 (1+ y))))
+                             1)))
+           (month          ;; Search forward from Muharram.
+            (1+ (calendar-sum m 1
+                              (> date
+                                 (calendar-absolute-from-islamic
+                                  (list m
+                                        (islamic-calendar-last-day-of-month
+                                         m year)
+                                        year)))
+                              1)))
+           (day            ;; Calculate the day by subtraction.
+            (- date
+               (1- (calendar-absolute-from-islamic (list month 1 year))))))
+      (list month day year))))
+
+(defvar calendar-islamic-month-name-array
+  ["Muharram" "Safar" "Rabi I" "Rabi II" "Jumada I" "Jumada II"
+   "Rajab" "Sha'ban" "Ramadan" "Shawwal" "Dhu al-Qada" "Dhu al-Hijjah"])
+
+(defun calendar-islamic-date-string (&optional date)
+  "String of Islamic date before sunset of Gregorian DATE.
+Returns the empty string if DATE is pre-Islamic.
+Defaults to today's date if DATE is not given.
+Driven by the variable `calendar-date-display-form'."
+  (let ((calendar-month-name-array calendar-islamic-month-name-array)
+        (islamic-date (calendar-islamic-from-absolute
+                       (calendar-absolute-from-gregorian
+                        (or date (calendar-current-date))))))
+    (if (< (extract-calendar-year islamic-date) 1)
+        ""
+      (calendar-date-string islamic-date nil t))))
+
+(defun calendar-print-islamic-date ()
+  "Show the Islamic calendar equivalent of the date under the cursor."
+  (interactive)
+  (let ((i (calendar-islamic-date-string (calendar-cursor-to-date t))))
+    (if (string-equal i "")
+        (message "Date is pre-Islamic")
+      (message "Islamic date (until sunset): %s" i))))
+
+(defun calendar-hebrew-from-absolute (date)
+  "Compute the Hebrew date (month day year) corresponding to absolute DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+  (let* ((greg-date (calendar-gregorian-from-absolute date))
+         (month (aref [9 10 11 12 1 2 3 4 7 7 7 8]
+                 (1- (extract-calendar-month greg-date))))
+         (day)
+         (year (+ 3760 (extract-calendar-year greg-date))))
+    (while (>= date (calendar-absolute-from-hebrew (list 7 1 (1+ year))))
+        (setq year (1+ year)))
+    (let ((length (hebrew-calendar-last-month-of-year year)))
+      (while (> date
+                (calendar-absolute-from-hebrew
+                 (list month
+                       (hebrew-calendar-last-day-of-month month year)
+                       year)))
+        (setq month (1+ (% month length)))))
+    (setq day (1+
+               (- date (calendar-absolute-from-hebrew (list month 1 year)))))
+    (list month day year)))
+
+(defun hebrew-calendar-leap-year-p (year)
+  "t if YEAR is a Hebrew calendar leap year."
+  (< (% (1+ (* 7 year)) 19) 7))
+
+(defun hebrew-calendar-last-month-of-year (year)
+  "The last month of the Hebrew calendar YEAR."
+  (if (hebrew-calendar-leap-year-p year)
+      13
+    12))
+
+(defun hebrew-calendar-last-day-of-month (month year)
+  "The last day of MONTH in YEAR."
+  (if (or (memq month (list 2 4 6 10 13))
+          (and (= month 12) (not (hebrew-calendar-leap-year-p year)))
+          (and (= month 8) (not (hebrew-calendar-long-heshvan-p year)))
+          (and (= month 9) (hebrew-calendar-short-kislev-p year)))
+      29
+    30))
+
+(defun hebrew-calendar-elapsed-days (year)
+  "Days from Sun. prior to start of Hebrew calendar to mean conjunction of Tishri of Hebrew YEAR."
+  (let* ((months-elapsed
+          (+ (* 235 (/ (1- year) 19));; Months in complete cycles so far.
+             (* 12 (% (1- year) 19))      ;; Regular months in this cycle
+             (/ (1+ (* 7 (% (1- year) 19))) 19)));; Leap months this cycle
+         (parts-elapsed (+ 204 (* 793 (% months-elapsed 1080))))
+         (hours-elapsed (+ 5
+                           (* 12 months-elapsed)
+                           (* 793 (/ months-elapsed 1080))
+                           (/ parts-elapsed 1080)))
+         (parts                                  ;; Conjunction parts
+          (+ (* 1080 (% hours-elapsed 24)) (% parts-elapsed 1080)))
+         (day                                    ;; Conjunction day
+          (+ 1 (* 29 months-elapsed) (/ hours-elapsed 24)))
+         (alternative-day
+          (if (or (>= parts 19440)    ;; If the new moon is at or after midday,
+                  (and (= (% day 7) 2);; ...or is on a Tuesday...
+                       (>= parts 9924)  ;;    at 9 hours, 204 parts or later...
+                       (not (hebrew-calendar-leap-year-p year)));; of a
+                                                                ;; common year,
+                  (and (= (% day 7) 1);; ...or is on a Monday...
+                       (>= parts 16789) ;;   at 15 hours, 589 parts or later...
+                       (hebrew-calendar-leap-year-p (1- year))));; at the end
+                                                     ;; of a leap year
+       ;; Then postpone Rosh HaShanah one day
+              (1+ day)
+       ;; Else
+            day)))
+    (if ;; If Rosh HaShanah would occur on Sunday, Wednesday, or Friday
+        (memq (% alternative-day 7) (list 0 3 5))
+  ;; Then postpone it one (more) day and return        
+        (1+ alternative-day)
+  ;; Else return        
+      alternative-day)))
+
+(defun hebrew-calendar-days-in-year (year)
+  "Number of days in Hebrew YEAR."
+  (- (hebrew-calendar-elapsed-days (1+ year))
+     (hebrew-calendar-elapsed-days year)))
+
+(defun hebrew-calendar-long-heshvan-p (year)
+  "t if Heshvan is long in Hebrew YEAR."
+  (= (% (hebrew-calendar-days-in-year year) 10) 5))
+
+(defun hebrew-calendar-short-kislev-p (year)
+  "t if Kislev is short in Hebrew YEAR."
+  (= (% (hebrew-calendar-days-in-year year) 10) 3))
+
+(defun calendar-absolute-from-hebrew (date)
+  "Absolute date of Hebrew DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+  (let* ((month (extract-calendar-month date))
+         (day (extract-calendar-day date))
+         (year (extract-calendar-year date)))
+    (+ day                            ;; Days so far this month.
+       (if (< month 7);; before Tishri
+     ;; Then add days in prior months this year before and after Nisan
+           (+ (calendar-sum
+               m 7 (<= m (hebrew-calendar-last-month-of-year year))
+               (hebrew-calendar-last-day-of-month m year))
+              (calendar-sum
+               m 1 (< m month)
+               (hebrew-calendar-last-day-of-month m year)))
+     ;; Else add days in prior months this year
+         (calendar-sum
+          m 7 (< m month)
+          (hebrew-calendar-last-day-of-month m year)))
+    (hebrew-calendar-elapsed-days year);; Days in prior years.
+    -1373429)))                        ;; Days elapsed before absolute date 1.
+
+(defvar calendar-hebrew-month-name-array-common-year
+  ["Nisan" "Iyar" "Sivan" "Tammuz" "Av" "Elul" "Tishri"
+   "Heshvan" "Kislev" "Teveth" "Shevat" "Adar"])
+
+(defvar calendar-hebrew-month-name-array-leap-year
+  ["Nisan" "Iyar" "Sivan" "Tammuz" "Av" "Elul" "Tishri"
+   "Heshvan" "Kislev" "Teveth" "Shevat" "Adar I" "Adar II"])
+
+(defun calendar-hebrew-date-string (&optional date)
+  "String of Hebrew date before sunset of Gregorian DATE.
+Defaults to today's date if DATE is not given.
+Driven by the variable `calendar-date-display-form'."
+  (let* ((hebrew-date (calendar-hebrew-from-absolute
+                       (calendar-absolute-from-gregorian
+                        (or date (calendar-current-date)))))
+         (calendar-month-name-array
+          (if (hebrew-calendar-leap-year-p (extract-calendar-year hebrew-date))
+              calendar-hebrew-month-name-array-leap-year
+            calendar-hebrew-month-name-array-common-year)))
+    (calendar-date-string hebrew-date nil t)))
+
+(defun calendar-print-hebrew-date ()
+  "Show the Hebrew calendar equivalent of the date under the cursor."
+  (interactive)
+  (message "Hebrew date (until sunset): %s"
+           (calendar-hebrew-date-string (calendar-cursor-to-date t))))
+
+(defun hebrew-calendar-yahrzeit (death-date year)
+  "Absolute date of the anniversary of Hebrew DEATH-DATE in Hebrew YEAR."
+  (let* ((death-day (extract-calendar-day death-date))
+         (death-month (extract-calendar-month death-date))
+         (death-year (extract-calendar-year death-date)))
+    (cond
+     ;; If it's Heshvan 30 it depends on the first anniversary; if
+     ;; that was not Heshvan 30, use the day before Kislev 1.
+     ((and (= death-month 8)
+           (= death-day 30)
+           (not (hebrew-calendar-long-heshvan-p (1+ death-year))))
+      (1- (calendar-absolute-from-hebrew (list 9 1 year))))
+     ;; If it's Kislev 30 it depends on the first anniversary; if
+     ;; that was not Kislev 30, use the day before Teveth 1.
+     ((and (= death-month 9)
+           (= death-day 30)
+           (hebrew-calendar-short-kislev-p (1+ death-year)))
+      (1- (calendar-absolute-from-hebrew (list 10 1 year))))
+     ;; If it's Adar II, use the same day in last month of
+     ;; year (Adar or Adar II).
+     ((= death-month 13)
+      (calendar-absolute-from-hebrew
+       (list (hebrew-calendar-last-month-of-year year) death-day year)))
+     ;; If it's the 30th in Adar I and year is not a leap year
+     ;; (so Adar has only 29 days), use the last day in Shevat.
+     ((and (= death-day 30)
+           (= death-month 12)
+           (not (hebrew-calendar-leap-year-p year)))
+      (calendar-absolute-from-hebrew (list 11 30 year)))
+     ;; In all other cases, use the normal anniversary of the date of death.
+     (t (calendar-absolute-from-hebrew
+         (list death-month death-day year))))))
+
+(defun calendar-set-mode-line (str)
+  "Set mode line to STR, centered, surrounded by dashes."
+  (setq mode-line-format
+        (calendar-string-spread (list "" str "") ?- (frame-width))))
+
+;;;###autoload
+(defun list-yahrzeit-dates (death-date start-year end-year)
+  "List Yahrzeit dates for *Gregorian* DEATH-DATE from START-YEAR to END-YEAR.
+When called interactively from the calendar window, the date of death is taken
+from the cursor position."
+  (interactive
+   (let* ((death-date
+           (if (equal (current-buffer) (get-buffer calendar-buffer))
+               (calendar-cursor-to-date)
+             (let* ((today (calendar-current-date))
+                    (year (calendar-read
+                           "Year of death (>0): "
+                           '(lambda (x) (> x 0))
+                           (int-to-string (extract-calendar-year today))))
+                    (month-array calendar-month-name-array)
+                    (completion-ignore-case t)
+                    (month (cdr (assoc
+                                 (capitalize
+                                  (completing-read
+                                   "Month of death (name): "
+                                   (mapcar 'list (append month-array nil))
+                                   nil t))
+                                 (calendar-make-alist
+                                  month-array 1 'capitalize))))
+                    (last (calendar-last-day-of-month month year))
+                    (day (calendar-read
+                          (format "Day of death (1-%d): " last)
+                          '(lambda (x) (and (< 0 x) (<= x last))))))
+               (list month day year))))
+          (death-year (extract-calendar-year death-date))
+          (start-year (calendar-read
+                       (format "Starting year of Yahrzeit table (>%d): "
+                               death-year)
+                       '(lambda (x) (> x death-year))
+                       (int-to-string (1+ death-year))))
+          (end-year (calendar-read
+                     (format "Ending year of Yahrzeit table (>=%d): "
+                             start-year)
+                       '(lambda (x) (>= x start-year)))))
+   (list death-date start-year end-year)))
+  (message "Computing yahrzeits...")
+  (let* ((yahrzeit-buffer "*Yahrzeits*")
+         (h-date (calendar-hebrew-from-absolute
+                  (calendar-absolute-from-gregorian death-date)))
+         (h-month (extract-calendar-month h-date))
+         (h-day (extract-calendar-day h-date))
+         (h-year (extract-calendar-year h-date)))
+    (set-buffer (get-buffer-create yahrzeit-buffer))
+    (setq buffer-read-only nil)
+    (calendar-set-mode-line
+     (format "Yahrzeit dates for %s = %s"
+             (calendar-date-string death-date)
+             (let ((calendar-month-name-array
+                    (if (hebrew-calendar-leap-year-p h-year)
+                        calendar-hebrew-month-name-array-leap-year
+                      calendar-hebrew-month-name-array-common-year)))
+               (calendar-date-string h-date nil t))))
+    (erase-buffer)
+    (goto-char (point-min))
+    (calendar-for-loop i from start-year to end-year do
+        (insert
+         (calendar-date-string
+          (calendar-gregorian-from-absolute
+           (hebrew-calendar-yahrzeit
+            h-date
+            (extract-calendar-year
+             (calendar-hebrew-from-absolute
+              (calendar-absolute-from-gregorian (list 1 1 i))))))) "\n"))
+    (goto-char (point-min))
+    (set-buffer-modified-p nil)
+    (setq buffer-read-only t)
+    (display-buffer yahrzeit-buffer)
+    (message "Computing yahrzeits...done")))
+
+(defun calendar-astro-date-string (&optional date)
+  "String of astronomical (Julian) day number of afternoon of Gregorian DATE.
+Defaults to today's date if DATE is not given."
+  (int-to-string
+   (+ 1721425 (calendar-absolute-from-gregorian
+               (or date (calendar-current-date))))))
+
+(defun calendar-print-astro-day-number ()
+  "Show astronomical (Julian) day number of afternoon on date shown by cursor."
+  (interactive)
+  (message
+   "Astronomical (Julian) day number after noon UTC: %s"
+   (calendar-astro-date-string (calendar-cursor-to-date t))))
+
+(defun calendar-goto-astro-day-number (daynumber &optional noecho)
+  "Move cursor to astronomical (Julian) DAYNUMBER.
+Echo astronomical (Julian) day number unless NOECHO is t."
+  (interactive (list (calendar-read
+                      "Astronomical (Julian) day number (>1721425): "
+                      '(lambda (x) (> x 1721425)))))
+  (calendar-goto-date (calendar-gregorian-from-absolute (- daynumber 1721425)))
+  (or noecho (calendar-print-astro-day-number)))
+
+(run-hooks 'calendar-load-hook)
+
+(provide 'calendar)
+
+;;; calendar.el ends here