(defun mark (&optional force)
(si:mark))
-;;; @@ current-time
+;;; @@ current-time.
;;;
+(defvar current-time-world-timezones
+ '(("PST" . -800)("PDT" . -700)("MST" . -700)
+ ("MDT" . -600)("CST" . -600)("CDT" . -500)
+ ("EST" . -500)("EDT" . -400)("AST" . -400)
+ ("NST" . -330)("UT" . +000)("GMT" . +000)
+ ("BST" . +100)("MET" . +100)("EET" . +200)
+ ("JST" . +900)("GMT+1" . +100)("GMT+2" . +200)
+ ("GMT+3" . +300)("GMT+4" . +400)("GMT+5" . +500)
+ ("GMT+6" . +600)("GMT+7" . +700)("GMT+8" . +800)
+ ("GMT+9" . +900)("GMT+10" . +1000)("GMT+11" . +1100)
+ ("GMT+12" . +1200)("GMT+13" . +1300)("GMT-1" . -100)
+ ("GMT-2" . -200)("GMT-3" . -300)("GMT-4" . -400)
+ ("GMT-5" . -500)("GMT-6" . -600)("GMT-7" . -700)
+ ("GMT-8" . -800)("GMT-9" . -900)("GMT-10" . -1000)
+ ("GMT-11" . -1100) ("GMT-12" . -1200))
+ "Time differentials of timezone from GMT in +-HHMM form.
+Used in `current-time-zone' (Emacs 19 emulating function in poe-18.el).")
+
+(defvar current-time-local-timezone nil
+ "*Local timezone name.
+Used in `current-time-zone' (Emacs 19 emulating function in poe-18.el).")
+
+(defun current-time-zone (&optional specified-time)
+ "Return the offset and name for the local time zone.
+This returns a list of the form (OFFSET NAME).
+OFFSET is an integer number of seconds ahead of UTC (east of Greenwich).
+ A negative value means west of Greenwich.
+NAME is a string giving the name of the time zone.
+Optional argument SPECIFIED-TIME is ignored in this implementation.
+Some operating systems cannot provide all this information to Emacs;
+in this case, `current-time-zone' returns a list containing nil for
+the data it can't find."
+ (let ((local-timezone
+ (or current-time-local-timezone
+ (setq current-time-local-timezone
+ (with-temp-buffer
+ (call-process "date" nil (current-buffer) t)
+ (goto-char (point-min))
+ (if (looking-at
+ "^.*\\([A-Z][A-Z][A-Z]\\([^ \n\t]*\\)\\).*$")
+ (buffer-substring (match-beginning 1)
+ (match-end 1)))))))
+ timezone abszone seconds)
+ (setq timezone
+ (or (cdr (assoc (upcase local-timezone)
+ current-time-world-timezones))
+ ;; "+900" style or nil.
+ local-timezone))
+ (when timezone
+ (if (stringp timezone)
+ (setq timezone (string-to-int timezone)))
+ ;; Taking account of minute in timezone.
+ ;; HHMM -> MM
+ (setq abszone (if (< timezone 0) (- timezone) timezone))
+ (setq seconds (* 60 (+ (* 60 (/ abszone 100)) (% abszone 100))))
+ (list (if (< timezone 0) (- seconds) seconds)
+ local-timezone))))
+
(or (fboundp 'si:current-time-string)
(fset 'si:current-time-string (symbol-function 'current-time-string)))
(defun current-time-string (&optional specified-time)
Programs can use this function to decode a time,
since the number of columns in each field is fixed.
The format is `Sun Sep 16 01:03:52 1973'.
-If an argument is given, it specifies a time to format
+If an argument SPECIFIED-TIME is given, it specifies a time to format
instead of the current time. The argument should have the form:
(HIGH . LOW)
or the form:
(HIGH LOW . IGNORED).
Thus, you can use times obtained from `current-time'
-and from `file-attributes'.
-\[poe-18.el; EMACS 19 emulating function]"
+and from `file-attributes'."
(if (null specified-time)
(si:current-time-string)
- (unless (consp specified-time)
- (error "Wrong type argument %s" specified-time))
+ (or (consp specified-time)
+ (error "Wrong type argument %s" specified-time))
(let ((high (car specified-time))
(low (cdr specified-time))
+ (offset (or (car (current-time-zone)) 0))
(mdays '(31 28 31 30 31 30 31 31 30 31 30 31))
(mnames '("Jan" "Feb" "Mar" "Apr" "May" "Jun"
"Jul" "Aug" "Sep" "Oct" "Nov" "Dec"))
(wnames '("Sun" "Mon" "Tue" "Wed" "Thu" "Fri" "Sat"))
- days dd yyyy mm HH MM SS)
+ days dd yyyy lyear mm HH MM SS)
(if (consp low)
(setq low (car low)))
- (unless (integerp high)
- (error "Wrong type argument %s" high))
- (unless (integerp low)
- (error "Wrong type argument %s" low))
- (setq low (+ low 32400))
+ (or (integerp high)
+ (error "Wrong type argument %s" high))
+ (or (integerp low)
+ (error "Wrong type argument %s" low))
+ (setq low (+ low offset))
(while (> low 65535)
(setq high (1+ high)
low (- low 65536)))
(setq yyyy 1970)
(while (or (> high 481)
- (and (eq high 481)
+ (and (= high 481)
(>= low 13184)))
- (when (and (> high 0)
- (< low 13184))
- (setq high (1- high)
- low (+ 65536 low)))
+ (if (and (> high 0)
+ (< low 13184))
+ (setq high (1- high)
+ low (+ 65536 low)))
(setq high (- high 481)
low (- low 13184))
(if (and (zerop (% yyyy 4))
(or (not (zerop (% yyyy 100)))
- (zerop (% yyyy 400))))
+ (zerop (% yyyy 400))))
(progn
- (when (and (> high 0)
- (< low 20864))
- (setq high (1- high)
- low (+ 65536 low)))
+ (if (and (> high 0)
+ (< low 20864))
+ (setq high (1- high)
+ low (+ 65536 low)))
(setq high (- high 1)
low (- low 20864))))
(setq yyyy (1+ yyyy)))
(setq dd 1)
(while (or (> high 1)
- (and (eq high 1)
+ (and (= high 1)
(>= low 20864)))
- (when (and (> high 0)
- (< low 20864))
- (setq high (1- high)
- low (+ 65536 low)))
+ (if (and (> high 0)
+ (< low 20864))
+ (setq high (1- high)
+ low (+ 65536 low)))
(setq high (- high 1)
low (- low 20864)
dd (1+ dd)))
(setq days dd)
- (if (eq high 1)
+ (if (= high 1)
(setq low (+ 65536 low)))
(setq mm 0)
- (setq uru (and (zerop (% yyyy 4))
- (or (not (zerop (% yyyy 100)))
- (zerop (% yyyy 400)))))
+ (setq lyear (and (zerop (% yyyy 4))
+ (or (not (zerop (% yyyy 100)))
+ (zerop (% yyyy 400)))))
(while (> (- dd (nth mm mdays)) 0)
- (if (and (eq mm 1) uru)
+ (if (and (= mm 1) lyear)
(setq dd (- dd 29))
(setq dd (- dd (nth mm mdays))))
(setq mm (1+ mm)))
count.
The microsecond count is zero on systems that do not provide
-resolution finer than a second.
-\[poe-18.el; EMACS 19 emulating function]"
+resolution finer than a second."
(let* ((str (current-time-string))
(yyyy (string-to-int (substring str 20 24)))
(mm (length (member (substring str 4 7)
(HH (string-to-int (substring str 11 13)))
(MM (string-to-int (substring str 14 16)))
(SS (string-to-int (substring str 17 19)))
+ (offset (or (car (current-time-zone)) 0))
dn ct1 ct2 i1 i2
year uru)
(setq ct1 0 ct2 0 i1 0 i2 0)
ct2 (+ (+ i2 (% ct2 65536))
(% (+ (* HH 3600) (* MM 60) SS)
65536)))
- (while (< (- ct2 32400) 0)
+ (while (< (- ct2 offset) 0)
(setq ct1 (1- ct1)
ct2 (+ ct2 65536)))
- (setq ct2 (- ct2 32400))
+ (setq ct2 (- ct2 offset))
(while (> ct2 65535)
(setq ct1 (1+ ct1)
ct2 (- ct2 65536)))
--- /dev/null
+;;; timezone.el --- time zone package for GNU Emacs
+
+;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+
+;; Author: Masanobu Umeda
+;; Maintainer: umerin@mse.kyutech.ac.jp
+;; Keywords: news
+
+;; This file 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.
+
+;; This file 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 GNU Emacs; see the file COPYING. If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Modified 1 February 1994 by Kyle Jones to fix broken
+;; timezone-floor function.
+
+;; Modified 25 January 1994 by Kyle Jones so that it will
+;; work under version 18 of Emacs. Provided timezone-floor
+;; and timezone-abs functions.
+
+;; Modified 4 October 1999 by Yuuichi Teranishi so that it will
+;; work with old GNUS 3.14.4 under version 18 of Emacs.
+
+;; Modified 5 October 1999 by Yuuichi Teranishi to fix y2k problem
+;; of timezone-parse-date function.
+
+;;; Code:
+
+(defvar timezone-world-timezones
+ '(("PST" . -800)
+ ("PDT" . -700)
+ ("MST" . -700)
+ ("MDT" . -600)
+ ("CST" . -600)
+ ("CDT" . -500)
+ ("EST" . -500)
+ ("EDT" . -400)
+ ("AST" . -400) ;by <clamen@CS.CMU.EDU>
+ ("NST" . -330) ;by <clamen@CS.CMU.EDU>
+ ("UT" . +000)
+ ("GMT" . +000)
+ ("BST" . +100)
+ ("MET" . +100)
+ ("EET" . +200)
+ ("JST" . +900)
+ ("GMT+1" . +100) ("GMT+2" . +200) ("GMT+3" . +300)
+ ("GMT+4" . +400) ("GMT+5" . +500) ("GMT+6" . +600)
+ ("GMT+7" . +700) ("GMT+8" . +800) ("GMT+9" . +900)
+ ("GMT+10" . +1000) ("GMT+11" . +1100) ("GMT+12" . +1200) ("GMT+13" . +1300)
+ ("GMT-1" . -100) ("GMT-2" . -200) ("GMT-3" . -300)
+ ("GMT-4" . -400) ("GMT-5" . -500) ("GMT-6" . -600)
+ ("GMT-7" . -700) ("GMT-8" . -800) ("GMT-9" . -900)
+ ("GMT-10" . -1000) ("GMT-11" . -1100) ("GMT-12" . -1200))
+ "*Time differentials of timezone from GMT in +-HHMM form.
+This list is obsolescent, and is present only for backwards compatibility,
+because time zone names are ambiguous in practice.
+Use `current-time-zone' instead.")
+
+(defvar timezone-months-assoc
+ '(("JAN" . 1)("FEB" . 2)("MAR" . 3)
+ ("APR" . 4)("MAY" . 5)("JUN" . 6)
+ ("JUL" . 7)("AUG" . 8)("SEP" . 9)
+ ("OCT" . 10)("NOV" . 11)("DEC" . 12))
+ "Alist of first three letters of a month and its numerical representation.")
+
+(defun timezone-make-date-arpa-standard (date &optional local timezone)
+ "Convert DATE to an arpanet standard date.
+Optional 2nd argument LOCAL specifies the default local timezone of the DATE;
+if nil, GMT is assumed.
+Optional 3rd argument TIMEZONE specifies a time zone to be represented in;
+if nil, the local time zone is assumed."
+ (let ((new (timezone-fix-time date local timezone)))
+ (timezone-make-arpa-date (aref new 0) (aref new 1) (aref new 2)
+ (timezone-make-time-string
+ (aref new 3) (aref new 4) (aref new 5))
+ (aref new 6))
+ ))
+
+(defun timezone-make-date-sortable (date &optional local timezone)
+ "Convert DATE to a sortable date string.
+Optional 2nd argument LOCAL specifies the default local timezone of the DATE;
+if nil, GMT is assumed.
+Optional 3rd argument TIMEZONE specifies a timezone to be represented in;
+if nil, the local time zone is assumed."
+ (let ((new (timezone-fix-time date local timezone)))
+ (timezone-make-sortable-date (aref new 0) (aref new 1) (aref new 2)
+ (timezone-make-time-string
+ (aref new 3) (aref new 4) (aref new 5)))
+ ))
+
+\f
+;;
+;; Parsers and Constructors of Date and Time
+;;
+
+(defun timezone-make-arpa-date (year month day time &optional timezone)
+ "Make arpanet standard date string from YEAR, MONTH, DAY, and TIME.
+Optional argument TIMEZONE specifies a time zone."
+ (let ((zone
+ (if (listp timezone)
+ (let* ((m (timezone-zone-to-minute timezone))
+ (absm (if (< m 0) (- m) m)))
+ (format "%c%02d%02d"
+ (if (< m 0) ?- ?+) (/ absm 60) (% absm 60)))
+ timezone)))
+ (format "%02d %s %04d %s %s"
+ day
+ (capitalize (car (rassq month timezone-months-assoc)))
+ year
+ time
+ zone)))
+
+(defun timezone-make-sortable-date (year month day time)
+ "Make sortable date string from YEAR, MONTH, DAY, and TIME."
+ (format "%4d%02d%02d%s"
+ year month day time))
+
+(defun timezone-make-time-string (hour minute second)
+ "Make time string from HOUR, MINUTE, and SECOND."
+ (format "%02d:%02d:%02d" hour minute second))
+
+(defun timezone-parse-date (date)
+ "Parse DATE and return a vector [YEAR MONTH DAY TIME TIMEZONE].
+19 is prepended to year if necessary. Timezone may be nil if nothing.
+Understands the following styles:
+ (1) 14 Apr 89 03:20[:12] [GMT]
+ (2) Fri, 17 Mar 89 4:01[:33] [GMT]
+ (3) Mon Jan 16 16:12[:37] [GMT] 1989
+ (4) 6 May 1992 1641-JST (Wednesday)
+ (5) 22-AUG-1993 10:59:12.82
+ (6) Thu, 11 Apr 16:17:12 91 [MET]
+ (7) Mon, 6 Jul 16:47:20 T 1992 [MET]"
+ (condition-case nil
+ (progn
+ ;; Get rid of any text properties.
+ (and (stringp date)
+ (or (text-properties-at 0 date)
+ (next-property-change 0 date))
+ (setq date (copy-sequence date))
+ (set-text-properties 0 (length date) nil date))
+ (let ((date (or date ""))
+ (year nil)
+ (month nil)
+ (day nil)
+ (time nil)
+ (zone nil)) ;This may be nil.
+ (cond ((string-match
+ "\\([^ \t,]+\\),[ \t]+\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\(T[ \t]+\\|\\)\\([0-9]+\\)[ \t]*\\'" date)
+ ;; Styles: (6) and (7) without timezone
+ (setq year 6 month 3 day 2 time 4 zone nil))
+ ((string-match
+ "\\([^ \t,]+\\),[ \t]+\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\(T[ \t]+\\|\\)\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
+ ;; Styles: (6) and (7) with timezone and buggy timezone
+ (setq year 6 month 3 day 2 time 4 zone 7))
+ ((string-match
+ "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\'" date)
+ ;; Styles: (1) and (2) without timezone
+ (setq year 3 month 2 day 1 time 4 zone nil))
+ ((string-match
+ "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
+ ;; Styles: (1) and (2) with timezone and buggy timezone
+ (setq year 3 month 2 day 1 time 4 zone 5))
+ ((string-match
+ "\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([0-9]+\\)" date)
+ ;; Styles: (3) without timezone
+ (setq year 4 month 1 day 2 time 3 zone nil))
+ ((string-match
+ "\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9:]+\\)[ \t]+\\([-+a-zA-Z0-9]+\\)[ \t]+\\([0-9]+\\)" date)
+ ;; Styles: (3) with timezone
+ (setq year 5 month 1 day 2 time 3 zone 4))
+ ((string-match
+ "\\([0-9]+\\)[ \t]+\\([^ \t,]+\\)[ \t]+\\([0-9]+\\)[ \t]+\\([0-9]+\\)[ \t]*\\([-+a-zA-Z0-9]+\\)" date)
+ ;; Styles: (4) with timezone
+ (setq year 3 month 2 day 1 time 4 zone 5))
+ ((string-match
+ "\\([0-9]+\\)-\\([A-Za-z]+\\)-\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9]+:[0-9]+\\)\\.[0-9]+" date)
+ ;; Styles: (5) without timezone.
+ (setq year 3 month 2 day 1 time 4 zone nil))
+ )
+ (if year
+ (progn
+ (setq year
+ (substring date (match-beginning year) (match-end year)))
+ ;; It is now Dec 1992. 8 years before the end of the World.
+ (if (< (length year) 4)
+ ;; 2 digit years are bogus, so guess the century
+ (let ((yr (string-to-int year)))
+ (when (>= yr 100)
+ ;; What does a three digit year mean?
+ (setq yr (- yr 100)))
+ (setq year (format "%d%02d"
+ (if (< yr 70)
+ 20
+ 19)
+ yr))))
+ (let ((string (substring date
+ (match-beginning month)
+ (+ (match-beginning month) 3))))
+ (setq month
+ (int-to-string
+ (cdr (assoc (upcase string) timezone-months-assoc)))))
+
+ (setq day
+ (substring date (match-beginning day) (match-end day)))
+ (setq time
+ (substring date (match-beginning time) (match-end time)))))
+ (if zone
+ (setq zone
+ (substring date (match-beginning zone) (match-end zone))))
+ ;; Return a vector.
+ (if year
+ (vector year month day time zone)
+ (vector "0" "0" "0" "0" nil))
+ )
+ )
+ (t (signal 'error (list "Invalid date string" date)))))
+
+(defun timezone-parse-time (time)
+ "Parse TIME (HH:MM:SS) and return a vector [hour minute second].
+Recognize HH:MM:SS, HH:MM, HHMMSS, HHMM."
+ (let ((time (or time ""))
+ (hour nil)
+ (minute nil)
+ (second nil))
+ (cond ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\)\\'" time)
+ ;; HH:MM:SS
+ (setq hour 1 minute 2 second 3))
+ ((string-match "\\`\\([0-9]+\\):\\([0-9]+\\)\\'" time)
+ ;; HH:MM
+ (setq hour 1 minute 2 second nil))
+ ((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
+ ;; HHMMSS
+ (setq hour 1 minute 2 second 3))
+ ((string-match "\\`\\([0-9][0-9]\\)\\([0-9][0-9]\\)\\'" time)
+ ;; HHMM
+ (setq hour 1 minute 2 second nil))
+ )
+ ;; Return [hour minute second]
+ (vector
+ (if hour
+ (substring time (match-beginning hour) (match-end hour)) "0")
+ (if minute
+ (substring time (match-beginning minute) (match-end minute)) "0")
+ (if second
+ (substring time (match-beginning second) (match-end second)) "0"))
+ ))
+
+\f
+;; Miscellaneous
+
+(defun timezone-zone-to-minute (timezone)
+ "Translate TIMEZONE to an integer minute offset from GMT.
+TIMEZONE can be a cons cell containing the output of `current-time-zone',
+or an integer of the form +-HHMM, or a time zone name."
+ (cond
+ ((consp timezone)
+ (/ (car timezone) 60))
+ (timezone
+ (progn
+ (setq timezone
+ (or (and (stringp timezone) (cdr (assoc (upcase timezone) timezone-world-timezones)))
+ ;; +900
+ timezone))
+ (if (stringp timezone)
+ (setq timezone (string-to-int timezone)))
+ ;; Taking account of minute in timezone.
+ ;; HHMM -> MM
+ (let* ((abszone (timezone-abs timezone))
+ (minutes (+ (* 60 (/ abszone 100)) (% abszone 100))))
+ (if (< timezone 0) (- minutes) minutes))))
+ (t 0)))
+
+(defun timezone-time-from-absolute (date seconds)
+ "Compute the UTC time equivalent to DATE at time SECONDS after midnight.
+Return a list suitable as an argument to `current-time-zone',
+or nil if the date cannot be thus represented.
+DATE is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+ (let* ((current-time-origin 719163)
+ ;; (timezone-absolute-from-gregorian 1 1 1970)
+ (days (- date current-time-origin))
+ (days-1 (/ days 65536))
+ (days-2 (mod (/ days 256) 256))
+ (days-3 (mod days 256))
+ ;; (seconds-per-day (float 86400))
+ (seconds-per-day-1 1)
+ (seconds-per-day-2 81)
+ (seconds-per-day-3 128)
+ ;; (seconds (+ seconds (* days seconds-per-day)))
+ ;; (current-time-arithmetic-base (float 65536))
+ ;; (hi (floor (/ seconds current-time-arithmetic-base)))
+ ;; (hibase (* hi current-time-arithmetic-base))
+ ;; (lo (floor (- seconds hibase)))
+ (seconds-1 (/ seconds 65536))
+ (seconds-2 (mod (/ seconds 256) 256))
+ (seconds-3 (mod seconds 256))
+ hi lo
+ r
+ seconds-per-day*days-1
+ seconds-per-day*days-2
+ seconds-per-day*days-3)
+ (setq r (* days-3 seconds-per-day-3)
+ seconds-per-day*days-3 (mod r 256))
+ (setq r (+ (/ r 256)
+ (* days-2 seconds-per-day-3)
+ (* days-3 seconds-per-day-2))
+ seconds-per-day*days-2 (mod r 256))
+ (setq seconds-per-day*days-1 (+ (/ r 256)
+ (* days-1 seconds-per-day-3)
+ (* (/ days 256) seconds-per-day-2)
+ (* days seconds-per-day-1)))
+ (setq r (+ seconds-2 seconds-per-day*days-2)
+ seconds-2 (mod r 256)
+ seconds-1 (+ seconds-1 (/ r 256)))
+ (setq lo (+ (* seconds-2 256)
+ seconds-3 seconds-per-day*days-3))
+ (setq hi (+ seconds-1 seconds-per-day*days-1))
+ ;; (and (< (abs (- seconds (+ hibase lo))) 2) ; Check for integer overflow.
+ ;; (cons hi lo))
+ (cons hi lo)
+ ))
+
+(defun timezone-time-zone-from-absolute (date seconds)
+ "Compute the local time zone for DATE at time SECONDS after midnight.
+Return a list in the same format as current-time-zone's result,
+or nil if the local time zone could not be computed.
+DATE is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+ (and (fboundp 'current-time-zone)
+ (let ((utc-time (timezone-time-from-absolute date seconds)))
+ (and utc-time
+ (let ((zone (current-time-zone utc-time)))
+ (and (car zone) zone))))))
+
+(defsubst timezone-fix-time-1 (year month day hour minute second)
+ "Fix date and time.
+For old `timezone-fix-time' function.
+Arguments are YEAR, MONTH, DAY, HOUR, MINUTE and SECOND."
+ ;; MINUTE may be larger than 60 or smaller than -60.
+ (let ((hour-fix
+ (if (< minute 0)
+ ;;(/ (- minute 59) 60) (/ minute 60)
+ ;; ANSI C compliance about truncation of integer division
+ ;; by eggert@twinsun.com (Paul Eggert)
+ (- (/ (- 59 minute) 60)) (/ minute 60))))
+ (setq hour (+ hour hour-fix))
+ (setq minute (- minute (* 60 hour-fix))))
+ ;; HOUR may be larger than 24 or smaller than 0.
+ (cond ((<= 24 hour) ;24 -> 00
+ (setq hour (- hour 24))
+ (setq day (1+ day))
+ (if (< (timezone-last-day-of-month month year) day)
+ (progn
+ (setq month (1+ month))
+ (setq day 1)
+ (if (< 12 month)
+ (progn
+ (setq month 1)
+ (setq year (1+ year))
+ ))
+ )))
+ ((> 0 hour)
+ (setq hour (+ hour 24))
+ (setq day (1- day))
+ (if (> 1 day)
+ (progn
+ (setq month (1- month))
+ (if (> 1 month)
+ (progn
+ (setq month 12)
+ (setq year (1- year))
+ ))
+ (setq day (timezone-last-day-of-month month year))
+ )))
+ )
+ (vector year month day hour minute second))
+
+(defsubst timezone-fix-time-2 (date local timezone)
+ "Convert DATE (default timezone LOCAL) to YYYY-MM-DD-HH-MM-SS-ZONE vector.
+If LOCAL is nil, it is assumed to be GMT.
+If TIMEZONE is nil, use the local time zone."
+ (let* ((date (timezone-parse-date date))
+ (year (string-to-int (aref date 0)))
+ (year (cond ((< year 50)
+ (+ year 2000))
+ ((< year 100)
+ (+ year 1900))
+ (t year)))
+ (month (string-to-int (aref date 1)))
+ (day (string-to-int (aref date 2)))
+ (time (timezone-parse-time (aref date 3)))
+ (hour (string-to-int (aref time 0)))
+ (minute (string-to-int (aref time 1)))
+ (second (string-to-int (aref time 2)))
+ (local (or (aref date 4) local)) ;Use original if defined
+ (timezone
+ (or timezone
+ (timezone-time-zone-from-absolute
+ (timezone-absolute-from-gregorian month day year)
+ (+ second (* 60 (+ minute (* 60 hour)))))))
+ (diff (- (timezone-zone-to-minute timezone)
+ (timezone-zone-to-minute local)))
+ (minute (+ minute diff))
+ (hour-fix (timezone-floor minute 60)))
+ (setq hour (+ hour hour-fix))
+ (setq minute (- minute (* 60 hour-fix)))
+ ;; HOUR may be larger than 24 or smaller than 0.
+ (cond ((<= 24 hour) ;24 -> 00
+ (setq hour (- hour 24))
+ (setq day (1+ day))
+ (if (< (timezone-last-day-of-month month year) day)
+ (progn
+ (setq month (1+ month))
+ (setq day 1)
+ (if (< 12 month)
+ (progn
+ (setq month 1)
+ (setq year (1+ year))
+ ))
+ )))
+ ((> 0 hour)
+ (setq hour (+ hour 24))
+ (setq day (1- day))
+ (if (> 1 day)
+ (progn
+ (setq month (1- month))
+ (if (> 1 month)
+ (progn
+ (setq month 12)
+ (setq year (1- year))
+ ))
+ (setq day (timezone-last-day-of-month month year))
+ )))
+ )
+ (vector year month day hour minute second timezone)))
+
+(defun timezone-fix-time (a1 a2 a3 &optional a4 a5 a6)
+ "Fix date and time.
+(Old API: A1=YEAR A2=MONTH A3=DAY A4=HOUR A5=MINUTE A6=SECOND).
+Convert DATE (default timezone LOCAL) to YYYY-MM-DD-HH-MM-SS-ZONE vector.
+If LOCAL is nil, it is assumed to be GMT.
+If TIMEZONE is nil, use the local time zone.
+(New API: A1=DATE A2=LOCAL A3=TIMEZONE)"
+ (if a4
+ (timezone-fix-time-1 a1 a2 a3 a4 a5 a6)
+ (timezone-fix-time-2 a1 a2 a3)))
+
+;; Partly copied from Calendar program by Edward M. Reingold.
+;; Thanks a lot.
+
+(defun timezone-last-day-of-month (month year)
+ "The last day in MONTH during YEAR."
+ (if (and (= month 2) (timezone-leap-year-p year))
+ 29
+ (aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
+
+(defun timezone-leap-year-p (year)
+ "Return t if YEAR is a Gregorian leap year."
+ (or (and (zerop (% year 4))
+ (not (zerop (% year 100))))
+ (zerop (% year 400))))
+
+(defun timezone-day-number (month day year)
+ "Return the day number within the year of the date MONTH/DAY/YEAR."
+ (let ((day-of-year (+ day (* 31 (1- month)))))
+ (if (> month 2)
+ (progn
+ (setq day-of-year (- day-of-year (/ (+ 23 (* 4 month)) 10)))
+ (if (timezone-leap-year-p year)
+ (setq day-of-year (1+ day-of-year)))))
+ day-of-year))
+
+(defun timezone-absolute-from-gregorian (month day year)
+ "The number of days between the Gregorian date 12/31/1 BC and MONTH/DAY/YEAR.
+The Gregorian date Sunday, December 31, 1 BC is imaginary."
+ (+ (timezone-day-number month day year);; Days this year
+ (* 365 (1- year));; + Days in prior years
+ (/ (1- year) 4);; + Julian leap years
+ (- (/ (1- year) 100));; - century years
+ (/ (1- year) 400)));; + Gregorian leap years
+
+(defun timezone-abs (n)
+ "Return the absolute value of N."
+ (if (fboundp 'abs)
+ (abs n)
+ (if (< n 0) (- n) n)))
+
+(defun timezone-floor (n &optional divisor)
+ "Return the largest integer no grater than N.
+With optional DIVISOR, return the largest integer no greater than ARG/DIVISOR."
+ (if (fboundp 'floor)
+ (floor n divisor)
+ (if (null divisor)
+ (setq divisor 1))
+ (if (< n 0)
+ (- (/ (- divisor 1 n) divisor))
+ (/ n divisor))))
+
+(product-provide (provide 'timezone) (require 'apel-ver))
+
+;;; timezone.el ends here
projects / elisp / apel.git / commitdiff