|
0
|
1 ;;; timezone.el --- time zone package for GNU Emacs
|
|
|
2
|
|
|
3 ;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
|
|
|
4
|
|
|
5 ;; Author: Masanobu Umeda
|
|
|
6 ;; Maintainer: umerin@mse.kyutech.ac.jp
|
|
|
7 ;; Keywords: news
|
|
|
8
|
|
|
9 ;; This file is part of XEmacs.
|
|
|
10
|
|
|
11 ;; XEmacs is free software; you can redistribute it and/or modify it
|
|
|
12 ;; under the terms of the GNU General Public License as published by
|
|
|
13 ;; the Free Software Foundation; either version 2, or (at your option)
|
|
|
14 ;; any later version.
|
|
|
15
|
|
|
16 ;; XEmacs is distributed in the hope that it will be useful, but
|
|
|
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
19 ;; General Public License for more details.
|
|
|
20
|
|
|
21 ;; You should have received a copy of the GNU General Public License
|
|
16
|
22 ;; along with XEmacs; see the file COPYING. If not, write to the
|
|
|
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
|
24 ;; Boston, MA 02111-1307, USA.
|
|
0
|
25
|
|
|
26 ;;; Synched up with: FSF 19.30.
|
|
|
27
|
|
|
28 ;; Modified 1 February 1994 by Kyle Jones to fix broken
|
|
|
29 ;; timezone-floor function.
|
|
|
30
|
|
|
31 ;; Modified 25 January 1994 by Kyle Jones so that it will
|
|
|
32 ;; work under version 18 of Emacs. Provided timezone-floor
|
|
|
33 ;; and timezone-abs functions.
|
|
|
34
|
|
|
35 ;;; Code:
|
|
|
36
|
|
|
37 (provide 'timezone)
|
|
|
38
|
|
|
39 (defvar timezone-world-timezones
|
|
|
40 '(("PST" . -800)
|
|
|
41 ("PDT" . -700)
|
|
|
42 ("MST" . -700)
|
|
|
43 ("MDT" . -600)
|
|
|
44 ("CST" . -600)
|
|
|
45 ("CDT" . -500)
|
|
|
46 ("EST" . -500)
|
|
|
47 ("EDT" . -400)
|
|
|
48 ("AST" . -400) ;by <clamen@CS.CMU.EDU>
|
|
|
49 ("NST" . -330) ;by <clamen@CS.CMU.EDU>
|
|
|
50 ("UT" . +000)
|
|
|
51 ("GMT" . +000)
|
|
|
52 ("BST" . +100)
|
|
|
53 ("MET" . +100)
|
|
|
54 ("EET" . +200)
|
|
|
55 ("JST" . +900)
|
|
|
56 ("GMT+1" . +100) ("GMT+2" . +200) ("GMT+3" . +300)
|
|
|
57 ("GMT+4" . +400) ("GMT+5" . +500) ("GMT+6" . +600)
|
|
|
58 ("GMT+7" . +700) ("GMT+8" . +800) ("GMT+9" . +900)
|
|
|
59 ("GMT+10" . +1000) ("GMT+11" . +1100) ("GMT+12" . +1200) ("GMT+13" . +1300)
|
|
|
60 ("GMT-1" . -100) ("GMT-2" . -200) ("GMT-3" . -300)
|
|
|
61 ("GMT-4" . -400) ("GMT-5" . -500) ("GMT-6" . -600)
|
|
|
62 ("GMT-7" . -700) ("GMT-8" . -800) ("GMT-9" . -900)
|
|
|
63 ("GMT-10" . -1000) ("GMT-11" . -1100) ("GMT-12" . -1200))
|
|
|
64 "*Time differentials of timezone from GMT in +-HHMM form.
|
|
|
65 This list is obsolescent, and is present only for backwards compatibility,
|
|
|
66 because time zone names are ambiguous in practice.
|
|
|
67 Use `current-time-zone' instead.")
|
|
|
68
|
|
|
69 (defvar timezone-months-assoc
|
|
|
70 '(("JAN" . 1)("FEB" . 2)("MAR" . 3)
|
|
|
71 ("APR" . 4)("MAY" . 5)("JUN" . 6)
|
|
|
72 ("JUL" . 7)("AUG" . 8)("SEP" . 9)
|
|
|
73 ("OCT" . 10)("NOV" . 11)("DEC" . 12))
|
|
|
74 "Alist of first three letters of a month and its numerical representation.")
|
|
|
75
|
|
|
76 (defun timezone-make-date-arpa-standard (date &optional local timezone)
|
|
|
77 "Convert DATE to an arpanet standard date.
|
|
|
78 Optional 1st argument LOCAL specifies the default local timezone of the DATE;
|
|
|
79 if nil, GMT is assumed.
|
|
|
80 Optional 2nd argument TIMEZONE specifies a time zone to be represented in;
|
|
|
81 if nil, the local time zone is assumed."
|
|
|
82 (let ((new (timezone-fix-time date local timezone)))
|
|
|
83 (timezone-make-arpa-date (aref new 0) (aref new 1) (aref new 2)
|
|
|
84 (timezone-make-time-string
|
|
|
85 (aref new 3) (aref new 4) (aref new 5))
|
|
|
86 (aref new 6))
|
|
|
87 ))
|
|
|
88
|
|
|
89 (defun timezone-make-date-sortable (date &optional local timezone)
|
|
|
90 "Convert DATE to a sortable date string.
|
|
|
91 Optional 1st argument LOCAL specifies the default local timezone of the DATE;
|
|
|
92 if nil, GMT is assumed.
|
|
|
93 Optional 2nd argument TIMEZONE specifies a timezone to be represented in;
|
|
|
94 if nil, the local time zone is assumed."
|
|
|
95 (let ((new (timezone-fix-time date local timezone)))
|
|
|
96 (timezone-make-sortable-date (aref new 0) (aref new 1) (aref new 2)
|
|
|
97 (timezone-make-time-string
|
|
|
98 (aref new 3) (aref new 4) (aref new 5)))
|
|
|
99 ))
|
|
|
100
|
|
|
101
|
|
|
102 ;;
|
|
|
103 ;; Parsers and Constructors of Date and Time
|
|
|
104 ;;
|
|
|
105
|
|
|
106 (defun timezone-make-arpa-date (year month day time &optional timezone)
|
|
|
107 "Make arpanet standard date string from YEAR, MONTH, DAY, and TIME.
|
|
|
108 Optional argument TIMEZONE specifies a time zone."
|
|
|
109 (let ((zone
|
|
|
110 (if (listp timezone)
|
|
|
111 (let* ((m (timezone-zone-to-minute timezone))
|
|
|
112 (absm (if (< m 0) (- m) m)))
|
|
|
113 (format "%c%02d%02d"
|
|
|
114 (if (< m 0) ?- ?+) (/ absm 60) (% absm 60)))
|
|
|
115 timezone)))
|
|
|
116 (format "%02d %s %04d %s %s"
|
|
|
117 day
|
|
|
118 (capitalize (car (rassq month timezone-months-assoc)))
|
|
|
119 year
|
|
|
120 time
|
|
|
121 zone)))
|
|
|
122
|
|
|
123 (defun timezone-make-sortable-date (year month day time)
|
|
|
124 "Make sortable date string from YEAR, MONTH, DAY, and TIME."
|
|
|
125 (format "%4d%02d%02d%s"
|
|
|
126 year month day time))
|
|
|
127
|
|
|
128 (defun timezone-make-time-string (hour minute second)
|
|
|
129 "Make time string from HOUR, MINUTE, and SECOND."
|
|
|
130 (format "%02d:%02d:%02d" hour minute second))
|
|
|
131
|
|
86
|
132 ;;;###autoload
|
|
|
133 (define-error 'invalid-date "Invalid date string")
|
|
|
134
|
|
0
|
135 (defun timezone-parse-date (date)
|
|
|
136 "Parse DATE and return a vector [YEAR MONTH DAY TIME TIMEZONE].
|
|
|
137 19 is prepended to year if necessary. Timezone may be nil if nothing.
|
|
|
138 Understands the following styles:
|
|
|
139 (1) 14 Apr 89 03:20[:12] [GMT]
|
|
|
140 (2) Fri, 17 Mar 89 4:01[:33] [GMT]
|
|
|
141 (3) Mon Jan 16 16:12[:37] [GMT] 1989
|
|
|
142 (4) 6 May 1992 1641-JST (Wednesday)
|
|
|
143 (5) 22-AUG-1993 10:59:12.82
|
|
|
144 (6) Thu, 11 Apr 16:17:12 91 [MET]
|
|
|
145 (7) Mon, 6 Jul 16:47:20 T 1992 [MET]"
|
|
86
|
146 (condition-case nil
|
|
|
147 (progn
|
|
0
|
148 ;; Get rid of any text properties.
|
|
|
149 (and (stringp date)
|
|
|
150 (or (text-properties-at 0 date)
|
|
|
151 (next-property-change 0 date))
|
|
|
152 (setq date (copy-sequence date))
|
|
|
153 (set-text-properties 0 (length date) nil date))
|
|
|
154 (let ((date (or date ""))
|
|
|
155 (year nil)
|
|
|
156 (month nil)
|
|
|
157 (day nil)
|
|
|
158 (time nil)
|
|
|
159 (zone nil)) ;This may be nil.
|
|
|
160 (cond ((string-match
|
|
|
161 "\\([^ \t,]+\\),[ \t]+\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\(T[ \t]+\\|\\)\\([0-9]+\\)[ \t]*\\'" date)
|
|
|
162 ;; Styles: (6) and (7) without timezone
|
|
|
163 (setq year 6 month 3 day 2 time 4 zone nil))
|
|
|
164 ((string-match
|
|
|
165 "\\([^ \t,]+\\),[ \t]+\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\(T[ \t]+\\|\\)\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
|
|
|
166 ;; Styles: (6) and (7) with timezone and buggy timezone
|
|
|
167 (setq year 6 month 3 day 2 time 4 zone 7))
|
|
|
168 ((string-match
|
|
|
169 "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\'" date)
|
|
|
170 ;; Styles: (1) and (2) without timezone
|
|
|
171 (setq year 3 month 2 day 1 time 4 zone nil))
|
|
|
172 ((string-match
|
|
|
173 "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
|
|
|
174 ;; Styles: (1) and (2) with timezone and buggy timezone
|
|
|
175 (setq year 3 month 2 day 1 time 4 zone 5))
|
|
|
176 ((string-match
|
|
|
177 "\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([0-9]+\\)" date)
|
|
|
178 ;; Styles: (3) without timezone
|
|
|
179 (setq year 4 month 1 day 2 time 3 zone nil))
|
|
|
180 ((string-match
|
|
|
181 "\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([-+a-zA-Z0-9]+\\)[ \t]+\\([0-9]+\\)" date)
|
|
|
182 ;; Styles: (3) with timezone
|
|
|
183 (setq year 5 month 1 day 2 time 3 zone 4))
|
|
|
184 ((string-match
|
|
|
185 "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
|
|
|
186 ;; Styles: (4) with timezone
|
|
|
187 (setq year 3 month 2 day 1 time 4 zone 5))
|
|
|
188 ((string-match
|
|
|
189 "\\([0-9]+\\)-\\([A-Za-z]+\\)-\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9]+:[0-9]+\\)\\.[0-9]+" date)
|
|
|
190 ;; Styles: (5) without timezone.
|
|
|
191 (setq year 3 month 2 day 1 time 4 zone nil))
|
|
|
192 )
|
|
|
193 (if year
|
|
|
194 (progn
|
|
|
195 (setq year
|
|
|
196 (substring date (match-beginning year) (match-end year)))
|
|
|
197 ;; It is now Dec 1992. 8 years before the end of the World.
|
|
|
198 (if (< (length year) 4)
|
|
82
|
199 ;; 2 digit years are bogus, so guess the century
|
|
|
200 (let ((yr (string-to-int year)))
|
|
|
201 (when (>= yr 100)
|
|
|
202 ;; What does a three digit year mean?
|
|
|
203 (setq yr (- yr 100)))
|
|
|
204 (setq year (format "%d%02d"
|
|
|
205 (if (< yr 70)
|
|
|
206 20
|
|
|
207 19)
|
|
|
208 yr))))
|
|
0
|
209 (let ((string (substring date
|
|
|
210 (match-beginning month)
|
|
|
211 (+ (match-beginning month) 3))))
|
|
|
212 (setq month
|
|
|
213 (int-to-string
|
|
|
214 (cdr (assoc (upcase string) timezone-months-assoc)))))
|
|
|
215
|
|
|
216 (setq day
|
|
|
217 (substring date (match-beginning day) (match-end day)))
|
|
|
218 (setq time
|
|
|
219 (substring date (match-beginning time) (match-end time)))))
|
|
|
220 (if zone
|
|
|
221 (setq zone
|
|
|
222 (substring date (match-beginning zone) (match-end zone))))
|
|
|
223 ;; Return a vector.
|
|
|
224 (if year
|
|
|
225 (vector year month day time zone)
|
|
|
226 (vector "0" "0" "0" "0" nil))
|
|
86
|
227 )
|
|
|
228 )
|
|
|
229 (t (signal 'invalid-date (list date))))
|
|
|
230 )
|
|
0
|
231
|
|
|
232 (defun timezone-parse-time (time)
|
|
|
233 "Parse TIME (HH:MM:SS) and return a vector [hour minute second].
|
|
|
234 Recognize HH:MM:SS, HH:MM, HHMMSS, HHMM."
|
|
|
235 (let ((time (or time ""))
|
|
|
236 (hour nil)
|
|
|
237 (minute nil)
|
|
|
238 (second nil))
|
|
|
239 (cond ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\)\\'" time)
|
|
|
240 ;; HH:MM:SS
|
|
|
241 (setq hour 1 minute 2 second 3))
|
|
|
242 ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\)\\'" time)
|
|
|
243 ;; HH:MM
|
|
|
244 (setq hour 1 minute 2 second nil))
|
|
|
245 ((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
|
|
|
246 ;; HHMMSS
|
|
|
247 (setq hour 1 minute 2 second 3))
|
|
|
248 ((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
|
|
|
249 ;; HHMM
|
|
|
250 (setq hour 1 minute 2 second nil))
|
|
|
251 )
|
|
|
252 ;; Return [hour minute second]
|
|
|
253 (vector
|
|
|
254 (if hour
|
|
|
255 (substring time (match-beginning hour) (match-end hour)) "0")
|
|
|
256 (if minute
|
|
|
257 (substring time (match-beginning minute) (match-end minute)) "0")
|
|
|
258 (if second
|
|
|
259 (substring time (match-beginning second) (match-end second)) "0"))
|
|
|
260 ))
|
|
|
261
|
|
|
262
|
|
|
263 ;; Miscellaneous
|
|
|
264
|
|
|
265 (defun timezone-zone-to-minute (timezone)
|
|
|
266 "Translate TIMEZONE to an integer minute offset from GMT.
|
|
|
267 TIMEZONE can be a cons cell containing the output of current-time-zone,
|
|
|
268 or an integer of the form +-HHMM, or a time zone name."
|
|
|
269 (cond
|
|
|
270 ((consp timezone)
|
|
|
271 (/ (car timezone) 60))
|
|
|
272 (timezone
|
|
|
273 (progn
|
|
|
274 (setq timezone
|
|
|
275 (or (cdr (assoc (upcase timezone) timezone-world-timezones))
|
|
|
276 ;; +900
|
|
|
277 timezone))
|
|
|
278 (if (stringp timezone)
|
|
|
279 (setq timezone (string-to-int timezone)))
|
|
|
280 ;; Taking account of minute in timezone.
|
|
|
281 ;; HHMM -> MM
|
|
|
282 (let* ((abszone (timezone-abs timezone))
|
|
|
283 (minutes (+ (* 60 (/ abszone 100)) (% abszone 100))))
|
|
|
284 (if (< timezone 0) (- minutes) minutes))))
|
|
|
285 (t 0)))
|
|
|
286
|
|
|
287 (defun timezone-time-from-absolute (date seconds)
|
|
|
288 "Compute the UTC time equivalent to DATE at time SECONDS after midnight.
|
|
|
289 Return a list suitable as an argument to current-time-zone,
|
|
|
290 or nil if the date cannot be thus represented.
|
|
|
291 DATE is the number of days elapsed since the (imaginary)
|
|
|
292 Gregorian date Sunday, December 31, 1 BC."
|
|
|
293 (let* ((current-time-origin 719162)
|
|
|
294 ;; (timezone-absolute-from-gregorian 1 1 1970)
|
|
|
295 (days (- date current-time-origin))
|
|
|
296 (seconds-per-day (float 86400))
|
|
|
297 (seconds (+ seconds (* days seconds-per-day)))
|
|
|
298 (current-time-arithmetic-base (float 65536))
|
|
|
299 (hi (timezone-floor (/ seconds current-time-arithmetic-base)))
|
|
|
300 (hibase (* hi current-time-arithmetic-base))
|
|
|
301 (lo (timezone-floor (- seconds hibase))))
|
|
|
302 (and (< (timezone-abs (- seconds (+ hibase lo))) 2) ;; Check for integer overflow.
|
|
|
303 (cons hi lo))))
|
|
|
304
|
|
|
305 (defun timezone-time-zone-from-absolute (date seconds)
|
|
|
306 "Compute the local time zone for DATE at time SECONDS after midnight.
|
|
|
307 Return a list in the same format as current-time-zone's result,
|
|
|
308 or nil if the local time zone could not be computed.
|
|
|
309 DATE is the number of days elapsed since the (imaginary)
|
|
|
310 Gregorian date Sunday, December 31, 1 BC."
|
|
|
311 (and (fboundp 'current-time-zone)
|
|
|
312 (let ((utc-time (timezone-time-from-absolute date seconds)))
|
|
|
313 (and utc-time
|
|
|
314 (let ((zone (current-time-zone utc-time)))
|
|
|
315 (and (car zone) zone))))))
|
|
|
316
|
|
|
317 (defun timezone-fix-time (date local timezone)
|
|
|
318 "Convert DATE (default timezone LOCAL) to YYYY-MM-DD-HH-MM-SS-ZONE vector.
|
|
|
319 If LOCAL is nil, it is assumed to be GMT.
|
|
|
320 If TIMEZONE is nil, use the local time zone."
|
|
|
321 (let* ((date (timezone-parse-date date))
|
|
|
322 (year (string-to-int (aref date 0)))
|
|
|
323 (year (cond ((< year 50)
|
|
|
324 (+ year 2000))
|
|
|
325 ((< year 100)
|
|
|
326 (+ year 1900))
|
|
|
327 (t year)))
|
|
|
328 (month (string-to-int (aref date 1)))
|
|
|
329 (day (string-to-int (aref date 2)))
|
|
|
330 (time (timezone-parse-time (aref date 3)))
|
|
|
331 (hour (string-to-int (aref time 0)))
|
|
|
332 (minute (string-to-int (aref time 1)))
|
|
|
333 (second (string-to-int (aref time 2)))
|
|
|
334 (local (or (aref date 4) local)) ;Use original if defined
|
|
|
335 (timezone
|
|
|
336 (or timezone
|
|
|
337 (timezone-time-zone-from-absolute
|
|
|
338 (timezone-absolute-from-gregorian month day year)
|
|
|
339 (+ second (* 60 (+ minute (* 60 hour)))))))
|
|
|
340 (diff (- (timezone-zone-to-minute timezone)
|
|
|
341 (timezone-zone-to-minute local)))
|
|
|
342 (minute (+ minute diff))
|
|
|
343 (hour-fix (timezone-floor minute 60)))
|
|
|
344 (setq hour (+ hour hour-fix))
|
|
|
345 (setq minute (- minute (* 60 hour-fix)))
|
|
|
346 ;; HOUR may be larger than 24 or smaller than 0.
|
|
|
347 (cond ((<= 24 hour) ;24 -> 00
|
|
|
348 (setq hour (- hour 24))
|
|
|
349 (setq day (1+ day))
|
|
|
350 (if (< (timezone-last-day-of-month month year) day)
|
|
|
351 (progn
|
|
|
352 (setq month (1+ month))
|
|
|
353 (setq day 1)
|
|
|
354 (if (< 12 month)
|
|
|
355 (progn
|
|
|
356 (setq month 1)
|
|
|
357 (setq year (1+ year))
|
|
|
358 ))
|
|
|
359 )))
|
|
|
360 ((> 0 hour)
|
|
|
361 (setq hour (+ hour 24))
|
|
|
362 (setq day (1- day))
|
|
|
363 (if (> 1 day)
|
|
|
364 (progn
|
|
|
365 (setq month (1- month))
|
|
|
366 (if (> 1 month)
|
|
|
367 (progn
|
|
|
368 (setq month 12)
|
|
|
369 (setq year (1- year))
|
|
|
370 ))
|
|
|
371 (setq day (timezone-last-day-of-month month year))
|
|
|
372 )))
|
|
|
373 )
|
|
|
374 (vector year month day hour minute second timezone)))
|
|
|
375
|
|
|
376 ;; Partly copied from Calendar program by Edward M. Reingold.
|
|
|
377 ;; Thanks a lot.
|
|
|
378
|
|
|
379 (defun timezone-last-day-of-month (month year)
|
|
|
380 "The last day in MONTH during YEAR."
|
|
|
381 (if (and (= month 2) (timezone-leap-year-p year))
|
|
|
382 29
|
|
|
383 (aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
|
|
|
384
|
|
|
385 (defun timezone-leap-year-p (year)
|
|
|
386 "Returns t if YEAR is a Gregorian leap year."
|
|
|
387 (or (and (zerop (% year 4))
|
|
|
388 (not (zerop (% year 100))))
|
|
|
389 (zerop (% year 400))))
|
|
|
390
|
|
|
391 (defun timezone-day-number (month day year)
|
|
|
392 "Return the day number within the year of the date month/day/year."
|
|
|
393 (let ((day-of-year (+ day (* 31 (1- month)))))
|
|
|
394 (if (> month 2)
|
|
|
395 (progn
|
|
|
396 (setq day-of-year (- day-of-year (/ (+ 23 (* 4 month)) 10)))
|
|
|
397 (if (timezone-leap-year-p year)
|
|
|
398 (setq day-of-year (1+ day-of-year)))))
|
|
|
399 day-of-year))
|
|
|
400
|
|
|
401 (defun timezone-absolute-from-gregorian (month day year)
|
|
|
402 "The number of days between the Gregorian date 12/31/1 BC and month/day/year.
|
|
|
403 The Gregorian date Sunday, December 31, 1 BC is imaginary."
|
|
|
404 (+ (timezone-day-number month day year);; Days this year
|
|
|
405 (* 365 (1- year));; + Days in prior years
|
|
|
406 (/ (1- year) 4);; + Julian leap years
|
|
|
407 (- (/ (1- year) 100));; - century years
|
|
|
408 (/ (1- year) 400)));; + Gregorian leap years
|
|
|
409
|
|
|
410 (defun timezone-abs (n)
|
|
|
411 (if (fboundp 'abs)
|
|
|
412 (abs n)
|
|
|
413 (if (< n 0) (- n) n)))
|
|
|
414
|
|
|
415 (defun timezone-floor (n &optional divisor)
|
|
|
416 (if (fboundp 'floor)
|
|
|
417 (floor n divisor)
|
|
|
418 (if (null divisor)
|
|
|
419 (setq divisor 1))
|
|
|
420 (if (< n 0)
|
|
|
421 (- (/ (- divisor 1 n) divisor))
|
|
|
422 (/ n divisor))))
|
|
|
423
|
|
|
424 ;;; timezone.el ends here
|
