0
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1 ;;; timezone.el --- time zone package for GNU Emacs
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2
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3 ;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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4
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5 ;; Author: Masanobu Umeda
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6 ;; Maintainer: umerin@mse.kyutech.ac.jp
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7 ;; Keywords: news
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: FSF 19.30.
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26
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27 ;; Modified 1 February 1994 by Kyle Jones to fix broken
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28 ;; timezone-floor function.
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29
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30 ;; Modified 25 January 1994 by Kyle Jones so that it will
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31 ;; work under version 18 of Emacs. Provided timezone-floor
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32 ;; and timezone-abs functions.
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33
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34 ;;; Code:
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35
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36 (provide 'timezone)
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37
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38 (defvar timezone-world-timezones
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39 '(("PST" . -800)
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40 ("PDT" . -700)
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41 ("MST" . -700)
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42 ("MDT" . -600)
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43 ("CST" . -600)
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44 ("CDT" . -500)
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45 ("EST" . -500)
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46 ("EDT" . -400)
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47 ("AST" . -400) ;by <clamen@CS.CMU.EDU>
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48 ("NST" . -330) ;by <clamen@CS.CMU.EDU>
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49 ("UT" . +000)
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50 ("GMT" . +000)
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51 ("BST" . +100)
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52 ("MET" . +100)
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53 ("EET" . +200)
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54 ("JST" . +900)
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55 ("GMT+1" . +100) ("GMT+2" . +200) ("GMT+3" . +300)
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56 ("GMT+4" . +400) ("GMT+5" . +500) ("GMT+6" . +600)
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57 ("GMT+7" . +700) ("GMT+8" . +800) ("GMT+9" . +900)
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58 ("GMT+10" . +1000) ("GMT+11" . +1100) ("GMT+12" . +1200) ("GMT+13" . +1300)
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59 ("GMT-1" . -100) ("GMT-2" . -200) ("GMT-3" . -300)
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60 ("GMT-4" . -400) ("GMT-5" . -500) ("GMT-6" . -600)
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61 ("GMT-7" . -700) ("GMT-8" . -800) ("GMT-9" . -900)
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62 ("GMT-10" . -1000) ("GMT-11" . -1100) ("GMT-12" . -1200))
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63 "*Time differentials of timezone from GMT in +-HHMM form.
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64 This list is obsolescent, and is present only for backwards compatibility,
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65 because time zone names are ambiguous in practice.
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66 Use `current-time-zone' instead.")
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67
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68 (defvar timezone-months-assoc
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69 '(("JAN" . 1)("FEB" . 2)("MAR" . 3)
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70 ("APR" . 4)("MAY" . 5)("JUN" . 6)
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71 ("JUL" . 7)("AUG" . 8)("SEP" . 9)
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72 ("OCT" . 10)("NOV" . 11)("DEC" . 12))
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73 "Alist of first three letters of a month and its numerical representation.")
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74
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75 (defun timezone-make-date-arpa-standard (date &optional local timezone)
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76 "Convert DATE to an arpanet standard date.
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77 Optional 1st argument LOCAL specifies the default local timezone of the DATE;
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78 if nil, GMT is assumed.
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79 Optional 2nd argument TIMEZONE specifies a time zone to be represented in;
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80 if nil, the local time zone is assumed."
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81 (let ((new (timezone-fix-time date local timezone)))
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82 (timezone-make-arpa-date (aref new 0) (aref new 1) (aref new 2)
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83 (timezone-make-time-string
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84 (aref new 3) (aref new 4) (aref new 5))
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85 (aref new 6))
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86 ))
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87
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88 (defun timezone-make-date-sortable (date &optional local timezone)
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89 "Convert DATE to a sortable date string.
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90 Optional 1st argument LOCAL specifies the default local timezone of the DATE;
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91 if nil, GMT is assumed.
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92 Optional 2nd argument TIMEZONE specifies a timezone to be represented in;
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93 if nil, the local time zone is assumed."
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94 (let ((new (timezone-fix-time date local timezone)))
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95 (timezone-make-sortable-date (aref new 0) (aref new 1) (aref new 2)
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96 (timezone-make-time-string
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97 (aref new 3) (aref new 4) (aref new 5)))
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98 ))
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99
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100
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101 ;;
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102 ;; Parsers and Constructors of Date and Time
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103 ;;
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104
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105 (defun timezone-make-arpa-date (year month day time &optional timezone)
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106 "Make arpanet standard date string from YEAR, MONTH, DAY, and TIME.
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107 Optional argument TIMEZONE specifies a time zone."
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108 (let ((zone
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109 (if (listp timezone)
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110 (let* ((m (timezone-zone-to-minute timezone))
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111 (absm (if (< m 0) (- m) m)))
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112 (format "%c%02d%02d"
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113 (if (< m 0) ?- ?+) (/ absm 60) (% absm 60)))
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114 timezone)))
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115 (format "%02d %s %04d %s %s"
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116 day
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117 (capitalize (car (rassq month timezone-months-assoc)))
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118 year
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119 time
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120 zone)))
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121
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122 (defun timezone-make-sortable-date (year month day time)
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123 "Make sortable date string from YEAR, MONTH, DAY, and TIME."
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124 (format "%4d%02d%02d%s"
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125 year month day time))
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126
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127 (defun timezone-make-time-string (hour minute second)
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128 "Make time string from HOUR, MINUTE, and SECOND."
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129 (format "%02d:%02d:%02d" hour minute second))
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130
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131 (defun timezone-parse-date (date)
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132 "Parse DATE and return a vector [YEAR MONTH DAY TIME TIMEZONE].
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133 19 is prepended to year if necessary. Timezone may be nil if nothing.
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134 Understands the following styles:
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135 (1) 14 Apr 89 03:20[:12] [GMT]
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136 (2) Fri, 17 Mar 89 4:01[:33] [GMT]
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137 (3) Mon Jan 16 16:12[:37] [GMT] 1989
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138 (4) 6 May 1992 1641-JST (Wednesday)
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139 (5) 22-AUG-1993 10:59:12.82
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140 (6) Thu, 11 Apr 16:17:12 91 [MET]
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141 (7) Mon, 6 Jul 16:47:20 T 1992 [MET]"
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142 ;; Get rid of any text properties.
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143 (and (stringp date)
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144 (or (text-properties-at 0 date)
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145 (next-property-change 0 date))
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146 (setq date (copy-sequence date))
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147 (set-text-properties 0 (length date) nil date))
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148 (let ((date (or date ""))
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149 (year nil)
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150 (month nil)
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151 (day nil)
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152 (time nil)
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153 (zone nil)) ;This may be nil.
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154 (cond ((string-match
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155 "\\([^ \t,]+\\),[ \t]+\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\(T[ \t]+\\|\\)\\([0-9]+\\)[ \t]*\\'" date)
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156 ;; Styles: (6) and (7) without timezone
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157 (setq year 6 month 3 day 2 time 4 zone nil))
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158 ((string-match
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159 "\\([^ \t,]+\\),[ \t]+\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\(T[ \t]+\\|\\)\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
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160 ;; Styles: (6) and (7) with timezone and buggy timezone
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161 (setq year 6 month 3 day 2 time 4 zone 7))
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162 ((string-match
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163 "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\'" date)
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164 ;; Styles: (1) and (2) without timezone
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165 (setq year 3 month 2 day 1 time 4 zone nil))
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166 ((string-match
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167 "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
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168 ;; Styles: (1) and (2) with timezone and buggy timezone
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169 (setq year 3 month 2 day 1 time 4 zone 5))
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170 ((string-match
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171 "\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([0-9]+\\)" date)
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172 ;; Styles: (3) without timezone
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173 (setq year 4 month 1 day 2 time 3 zone nil))
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174 ((string-match
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175 "\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([-+a-zA-Z0-9]+\\)[ \t]+\\([0-9]+\\)" date)
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176 ;; Styles: (3) with timezone
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177 (setq year 5 month 1 day 2 time 3 zone 4))
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178 ((string-match
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179 "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
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180 ;; Styles: (4) with timezone
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181 (setq year 3 month 2 day 1 time 4 zone 5))
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182 ((string-match
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183 "\\([0-9]+\\)-\\([A-Za-z]+\\)-\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9]+:[0-9]+\\)\\.[0-9]+" date)
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184 ;; Styles: (5) without timezone.
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185 (setq year 3 month 2 day 1 time 4 zone nil))
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186 )
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187 (if year
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188 (progn
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189 (setq year
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190 (substring date (match-beginning year) (match-end year)))
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191 ;; It is now Dec 1992. 8 years before the end of the World.
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192 (if (< (length year) 4)
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193 (setq year (concat "19" (substring year -2 nil))))
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194 (let ((string (substring date
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195 (match-beginning month)
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196 (+ (match-beginning month) 3))))
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197 (setq month
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198 (int-to-string
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199 (cdr (assoc (upcase string) timezone-months-assoc)))))
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200
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201 (setq day
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202 (substring date (match-beginning day) (match-end day)))
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203 (setq time
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204 (substring date (match-beginning time) (match-end time)))))
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205 (if zone
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206 (setq zone
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207 (substring date (match-beginning zone) (match-end zone))))
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208 ;; Return a vector.
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209 (if year
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210 (vector year month day time zone)
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211 (vector "0" "0" "0" "0" nil))
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212 ))
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213
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214 (defun timezone-parse-time (time)
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215 "Parse TIME (HH:MM:SS) and return a vector [hour minute second].
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216 Recognize HH:MM:SS, HH:MM, HHMMSS, HHMM."
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217 (let ((time (or time ""))
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218 (hour nil)
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219 (minute nil)
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220 (second nil))
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221 (cond ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\)\\'" time)
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222 ;; HH:MM:SS
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223 (setq hour 1 minute 2 second 3))
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224 ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\)\\'" time)
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225 ;; HH:MM
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226 (setq hour 1 minute 2 second nil))
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227 ((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
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228 ;; HHMMSS
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229 (setq hour 1 minute 2 second 3))
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230 ((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
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231 ;; HHMM
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232 (setq hour 1 minute 2 second nil))
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233 )
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234 ;; Return [hour minute second]
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235 (vector
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236 (if hour
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237 (substring time (match-beginning hour) (match-end hour)) "0")
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238 (if minute
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239 (substring time (match-beginning minute) (match-end minute)) "0")
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240 (if second
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241 (substring time (match-beginning second) (match-end second)) "0"))
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242 ))
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243
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244
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245 ;; Miscellaneous
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246
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247 (defun timezone-zone-to-minute (timezone)
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248 "Translate TIMEZONE to an integer minute offset from GMT.
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249 TIMEZONE can be a cons cell containing the output of current-time-zone,
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250 or an integer of the form +-HHMM, or a time zone name."
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251 (cond
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252 ((consp timezone)
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253 (/ (car timezone) 60))
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254 (timezone
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255 (progn
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256 (setq timezone
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257 (or (cdr (assoc (upcase timezone) timezone-world-timezones))
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258 ;; +900
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259 timezone))
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260 (if (stringp timezone)
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261 (setq timezone (string-to-int timezone)))
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262 ;; Taking account of minute in timezone.
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263 ;; HHMM -> MM
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264 (let* ((abszone (timezone-abs timezone))
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265 (minutes (+ (* 60 (/ abszone 100)) (% abszone 100))))
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266 (if (< timezone 0) (- minutes) minutes))))
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267 (t 0)))
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268
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269 (defun timezone-time-from-absolute (date seconds)
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270 "Compute the UTC time equivalent to DATE at time SECONDS after midnight.
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271 Return a list suitable as an argument to current-time-zone,
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272 or nil if the date cannot be thus represented.
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273 DATE is the number of days elapsed since the (imaginary)
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274 Gregorian date Sunday, December 31, 1 BC."
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275 (let* ((current-time-origin 719162)
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276 ;; (timezone-absolute-from-gregorian 1 1 1970)
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277 (days (- date current-time-origin))
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278 (seconds-per-day (float 86400))
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279 (seconds (+ seconds (* days seconds-per-day)))
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280 (current-time-arithmetic-base (float 65536))
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281 (hi (timezone-floor (/ seconds current-time-arithmetic-base)))
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282 (hibase (* hi current-time-arithmetic-base))
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283 (lo (timezone-floor (- seconds hibase))))
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284 (and (< (timezone-abs (- seconds (+ hibase lo))) 2) ;; Check for integer overflow.
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285 (cons hi lo))))
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286
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287 (defun timezone-time-zone-from-absolute (date seconds)
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288 "Compute the local time zone for DATE at time SECONDS after midnight.
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289 Return a list in the same format as current-time-zone's result,
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290 or nil if the local time zone could not be computed.
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291 DATE is the number of days elapsed since the (imaginary)
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292 Gregorian date Sunday, December 31, 1 BC."
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293 (and (fboundp 'current-time-zone)
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294 (let ((utc-time (timezone-time-from-absolute date seconds)))
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295 (and utc-time
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296 (let ((zone (current-time-zone utc-time)))
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297 (and (car zone) zone))))))
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298
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299 (defun timezone-fix-time (date local timezone)
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300 "Convert DATE (default timezone LOCAL) to YYYY-MM-DD-HH-MM-SS-ZONE vector.
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301 If LOCAL is nil, it is assumed to be GMT.
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302 If TIMEZONE is nil, use the local time zone."
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303 (let* ((date (timezone-parse-date date))
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304 (year (string-to-int (aref date 0)))
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305 (year (cond ((< year 50)
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306 (+ year 2000))
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307 ((< year 100)
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308 (+ year 1900))
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309 (t year)))
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310 (month (string-to-int (aref date 1)))
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311 (day (string-to-int (aref date 2)))
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312 (time (timezone-parse-time (aref date 3)))
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313 (hour (string-to-int (aref time 0)))
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314 (minute (string-to-int (aref time 1)))
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315 (second (string-to-int (aref time 2)))
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316 (local (or (aref date 4) local)) ;Use original if defined
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317 (timezone
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318 (or timezone
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319 (timezone-time-zone-from-absolute
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320 (timezone-absolute-from-gregorian month day year)
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321 (+ second (* 60 (+ minute (* 60 hour)))))))
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322 (diff (- (timezone-zone-to-minute timezone)
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323 (timezone-zone-to-minute local)))
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324 (minute (+ minute diff))
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325 (hour-fix (timezone-floor minute 60)))
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326 (setq hour (+ hour hour-fix))
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327 (setq minute (- minute (* 60 hour-fix)))
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328 ;; HOUR may be larger than 24 or smaller than 0.
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329 (cond ((<= 24 hour) ;24 -> 00
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330 (setq hour (- hour 24))
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331 (setq day (1+ day))
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332 (if (< (timezone-last-day-of-month month year) day)
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333 (progn
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334 (setq month (1+ month))
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335 (setq day 1)
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336 (if (< 12 month)
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337 (progn
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338 (setq month 1)
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339 (setq year (1+ year))
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340 ))
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341 )))
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342 ((> 0 hour)
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343 (setq hour (+ hour 24))
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344 (setq day (1- day))
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345 (if (> 1 day)
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346 (progn
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347 (setq month (1- month))
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348 (if (> 1 month)
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349 (progn
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350 (setq month 12)
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351 (setq year (1- year))
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352 ))
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353 (setq day (timezone-last-day-of-month month year))
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354 )))
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355 )
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356 (vector year month day hour minute second timezone)))
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357
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358 ;; Partly copied from Calendar program by Edward M. Reingold.
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359 ;; Thanks a lot.
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360
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361 (defun timezone-last-day-of-month (month year)
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362 "The last day in MONTH during YEAR."
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363 (if (and (= month 2) (timezone-leap-year-p year))
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364 29
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365 (aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
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366
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367 (defun timezone-leap-year-p (year)
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368 "Returns t if YEAR is a Gregorian leap year."
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369 (or (and (zerop (% year 4))
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370 (not (zerop (% year 100))))
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371 (zerop (% year 400))))
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372
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373 (defun timezone-day-number (month day year)
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374 "Return the day number within the year of the date month/day/year."
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375 (let ((day-of-year (+ day (* 31 (1- month)))))
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376 (if (> month 2)
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377 (progn
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378 (setq day-of-year (- day-of-year (/ (+ 23 (* 4 month)) 10)))
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379 (if (timezone-leap-year-p year)
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380 (setq day-of-year (1+ day-of-year)))))
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381 day-of-year))
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382
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383 (defun timezone-absolute-from-gregorian (month day year)
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384 "The number of days between the Gregorian date 12/31/1 BC and month/day/year.
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385 The Gregorian date Sunday, December 31, 1 BC is imaginary."
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386 (+ (timezone-day-number month day year);; Days this year
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387 (* 365 (1- year));; + Days in prior years
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388 (/ (1- year) 4);; + Julian leap years
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389 (- (/ (1- year) 100));; - century years
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390 (/ (1- year) 400)));; + Gregorian leap years
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391
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392 (defun timezone-abs (n)
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393 (if (fboundp 'abs)
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394 (abs n)
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395 (if (< n 0) (- n) n)))
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396
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397 (defun timezone-floor (n &optional divisor)
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398 (if (fboundp 'floor)
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399 (floor n divisor)
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400 (if (null divisor)
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401 (setq divisor 1))
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402 (if (< n 0)
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403 (- (/ (- divisor 1 n) divisor))
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404 (/ n divisor))))
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405
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406 ;;; timezone.el ends here
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