1993-05-19 21:11:06 +00:00
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;;; Timezone package for GNU Emacs
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1993-05-19 21:15:30 +00:00
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;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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;;; Author: Masanobu Umeda
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;;; Maintainer: umerin@mse.kyutech.ac.jp
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1993-05-19 21:11:06 +00:00
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Code:
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(provide 'timezone)
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(defvar timezone-world-timezones
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'(("PST" . -800)
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("PDT" . -700)
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("MST" . -700)
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("MDT" . -600)
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("CST" . -600)
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("CDT" . -500)
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("EST" . -500)
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("EDT" . -400)
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("AST" . -400) ;by <clamen@CS.CMU.EDU>
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("NST" . -330) ;by <clamen@CS.CMU.EDU>
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("GMT" . +000)
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("BST" . +100)
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("MET" . +100)
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("EET" . +200)
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("JST" . +900)
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("GMT+1" . +100) ("GMT+2" . +200) ("GMT+3" . +300)
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("GMT+4" . +400) ("GMT+5" . +500) ("GMT+6" . +600)
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("GMT+7" . +700) ("GMT+8" . +800) ("GMT+9" . +900)
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("GMT+10" . +1000) ("GMT+11" . +1100) ("GMT+12" . +1200) ("GMT+13" . +1300)
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("GMT-1" . -100) ("GMT-2" . -200) ("GMT-3" . -300)
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("GMT-4" . -400) ("GMT-5" . -500) ("GMT-6" . -600)
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("GMT-7" . -700) ("GMT-8" . -800) ("GMT-9" . -900)
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("GMT-10" . -1000) ("GMT-11" . -1100) ("GMT-12" . -1200))
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"*Time differentials of timezone from GMT in hour.")
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(defvar timezone-months-assoc
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'(("JAN" . 1)("FEB" . 2)("MAR" . 3)
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("APR" . 4)("MAY" . 5)("JUN" . 6)
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("JUL" . 7)("AUG" . 8)("SEP" . 9)
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("OCT" . 10)("NOV" . 11)("DEC" . 12))
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"Alist of first three letters of a month and its numerical representation.")
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(defun timezone-make-date-arpa-standard (date &optional local timezone)
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"Convert DATE to an arpanet standard date.
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Optional 1st argumetn LOCAL specifies the default local timezone of the DATE.
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Optional 2nd argument TIMEZONE specifies a timezone to be represented in."
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(let* ((date (timezone-parse-date date))
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(year (string-to-int (aref date 0)))
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(month (string-to-int (aref date 1)))
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(day (string-to-int (aref date 2)))
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(time (timezone-parse-time (aref date 3)))
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(hour (string-to-int (aref time 0)))
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(minute (string-to-int (aref time 1)))
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(second (string-to-int (aref time 2)))
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(local (or (aref date 4) local)) ;Use original if defined
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(timezone (or timezone local))
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(diff (- (timezone-zone-to-minute timezone)
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(timezone-zone-to-minute local)))
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(new (timezone-fix-time year month day
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hour (+ minute diff) second)))
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(timezone-make-arpa-date (aref new 0) (aref new 1) (aref new 2)
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(timezone-make-time-string
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(aref new 3) (aref new 4) (aref new 5))
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timezone)
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))
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(defun timezone-make-date-sortable (date &optional local timezone)
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"Convert DATE to a sortable date string.
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Optional 1st argumetn LOCAL specifies the default local timezone of the DATE.
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Optional 2nd argument TIMEZONE specifies a timezone to be represented in."
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(let* ((date (timezone-parse-date date))
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(year (string-to-int (aref date 0)))
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(month (string-to-int (aref date 1)))
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(day (string-to-int (aref date 2)))
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(time (timezone-parse-time (aref date 3)))
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(hour (string-to-int (aref time 0)))
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(minute (string-to-int (aref time 1)))
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(second (string-to-int (aref time 2)))
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(local (or (aref date 4) local)) ;Use original if defined
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(timezone (or timezone local))
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(diff (- (timezone-zone-to-minute timezone)
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(timezone-zone-to-minute local)))
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(new (timezone-fix-time year month day
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hour (+ minute diff) second)))
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(timezone-make-sortable-date (aref new 0) (aref new 1) (aref new 2)
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(timezone-make-time-string
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(aref new 3) (aref new 4) (aref new 5)))
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))
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;;
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;; Parsers and Constructors of Date and Time
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;;
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(defun timezone-make-arpa-date (year month day time &optional timezone)
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"Make arpanet standard date string from YEAR, MONTH, DAY, and TIME.
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Optional argument TIMEZONE specifies a time zone."
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(format "%02d %s %4d %s%s"
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day
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(capitalize (car (rassq month timezone-months-assoc)))
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;;(- year (* (/ year 100) 100)) ;1990 -> 90
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(if (< year 100) (+ year 1900) year) ;90->1990
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time
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(if timezone (concat " " timezone) "")
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))
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(defun timezone-make-sortable-date (year month day time)
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"Make sortable date string from YEAR, MONTH, DAY, and TIME."
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(format "%4d%02d%02d%s"
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;;(- year (* (/ year 100) 100)) ;1990 -> 90
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(if (< year 100) (+ year 1900) year) ;90->1990
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month day time))
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(defun timezone-make-time-string (hour minute second)
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"Make time string from HOUR, MINUTE, and SECOND."
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(format "%02d:%02d:%02d" hour minute second))
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(defun timezone-parse-date (date)
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"Parse DATE and return a vector [year month day time timezone].
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19 is prepended to year if necessary. Timezone may be NIL if nothing.
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Understand the following styles:
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(1) 14 Apr 89 03:20[:12] [GMT]
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(2) Fri, 17 Mar 89 4:01[:33] [GMT]
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(3) Mon Jan 16 16:12[:37] [GMT] 1989
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(4) 6 May 1992 1641-JST (Wednesday)"
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(let ((date (or date ""))
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(year nil)
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(month nil)
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(day nil)
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(time nil)
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(zone nil)) ;This may be nil.
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(cond ((string-match
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"\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\'" date)
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;; Styles: (1) and (2) without timezone
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(setq year 3 month 2 day 1 time 4 zone nil))
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((string-match
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"\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
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;; Styles: (1) and (2) with timezone and buggy timezone
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(setq year 3 month 2 day 1 time 4 zone 5))
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((string-match
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"\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([0-9]+\\)" date)
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;; Styles: (3) without timezone
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(setq year 4 month 1 day 2 time 3 zone nil))
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((string-match
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"\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([-+a-zA-Z0-9]+\\)[ \t]+\\([0-9]+\\)" date)
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;; Styles: (3) with timezoen
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(setq year 5 month 1 day 2 time 3 zone 4))
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((string-match
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"\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
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;; Styles: (4) with timezone
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(setq year 3 month 2 day 1 time 4 zone 5))
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)
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(if year
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(progn
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(setq year
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(substring date (match-beginning year) (match-end year)))
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;; It is now Dec 1992. 8 years before the end of the World.
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(if (< (length year) 4)
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(setq year (concat "19" (substring year -2 nil))))
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(setq month
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(int-to-string
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(cdr
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(assoc
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(upcase
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;; Don't use `match-end' in order to take 3
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;; letters from the beginning.
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(substring date
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(match-beginning month)
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(+ (match-beginning month) 3)))
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timezone-months-assoc))))
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(setq day
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(substring date (match-beginning day) (match-end day)))
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(setq time
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(substring date (match-beginning time) (match-end time)))))
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(if zone
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(setq zone
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(substring date (match-beginning zone) (match-end zone))))
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;; Return a vector.
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(if year
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(vector year month day time zone)
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(vector "0" "0" "0" "0" nil))
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))
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(defun timezone-parse-time (time)
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"Parse TIME (HH:MM:SS) and return a vector [hour minute second].
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Recognize HH:MM:SS, HH:MM, HHMMSS, HHMM."
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(let ((time (or time ""))
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(hour nil)
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(minute nil)
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(second nil))
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(cond ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\)\\'" time)
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;; HH:MM:SS
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(setq hour 1 minute 2 second 3))
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((string-match "\\`\\([0-9]+\\):\\([0-9]+\\)\\'" time)
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;; HH:MM
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(setq hour 1 minute 2 second nil))
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((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
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;; HHMMSS
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(setq hour 1 minute 2 second 3))
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((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
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;; HHMM
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(setq hour 1 minute 2 second nil))
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)
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;; Return [hour minute second]
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(vector
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(if hour
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(substring time (match-beginning hour) (match-end hour)) "0")
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(if minute
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(substring time (match-beginning minute) (match-end minute)) "0")
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(if second
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(substring time (match-beginning second) (match-end second)) "0"))
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))
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;; Miscellaneous
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(defun timezone-zone-to-minute (timezone)
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"Translate TIMEZONE (in zone name or integer) to integer minute."
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(if timezone
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(progn
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(setq timezone
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(or (cdr (assoc (upcase timezone) timezone-world-timezones))
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;; +900
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timezone))
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(if (stringp timezone)
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(setq timezone (string-to-int timezone)))
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;; Taking account of minute in timezone.
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;; HHMM -> MM
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;;(+ (* 60 (/ timezone 100)) (% timezone 100))
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;; ANSI C compliance about truncation of integer division
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;; by eggert@twinsun.com (Paul Eggert)
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(let* ((abszone (max timezone (- timezone)))
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(minutes (+ (* 60 (/ abszone 100)) (% abszone 100))))
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(if (< timezone 0) (- minutes) minutes)))
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0))
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(defun timezone-fix-time (year month day hour minute second)
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"Fix date and time."
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;; MINUTE may be larger than 60 or smaller than -60.
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(let ((hour-fix
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(if (< minute 0)
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;;(/ (- minute 59) 60) (/ minute 60)
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;; ANSI C compliance about truncation of integer division
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;; by eggert@twinsun.com (Paul Eggert)
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(- (/ (- 59 minute) 60)) (/ minute 60))))
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(setq hour (+ hour hour-fix))
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(setq minute (- minute (* 60 hour-fix))))
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;; HOUR may be larger than 24 or smaller than 0.
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(cond ((<= 24 hour) ;24 -> 00
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(setq hour (- hour 24))
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(setq day (1+ day))
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(if (< (timezone-last-day-of-month month year) day)
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(progn
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(setq month (1+ month))
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(setq day 1)
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(if (< 12 month)
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(progn
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(setq month 1)
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(setq year (1+ year))
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))
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)))
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((> 0 hour)
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(setq hour (+ hour 24))
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(setq day (1- day))
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(if (> 1 day)
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(progn
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(setq month (1- month))
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(if (> 1 month)
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(progn
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(setq month 12)
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(setq year (1- year))
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))
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(setq day (timezone-last-day-of-month month year))
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)))
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)
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(vector year month day hour minute second))
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;; Partly copied from Calendar program by Edward M. Reingold.
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;; Thanks a lot.
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(defun timezone-last-day-of-month (month year)
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"The last day in MONTH during YEAR."
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(if (and (= month 2) (timezone-leap-year-p year))
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29
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(aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
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(defun timezone-leap-year-p (year)
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|
"Returns t if YEAR is a Gregorian leap year."
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|
(or (and (zerop (% year 4))
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(not (zerop (% year 100))))
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(zerop (% year 400))))
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1993-05-19 21:15:30 +00:00
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;;; timezone.el ends here
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