+++ /dev/null
-;;; time-date.el --- Date and time handling functions
-;; Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
-
-;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
-;; Masanobu Umeda <umerin@mse.kyutech.ac.jp>
-;; Keywords: mail news util
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs 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.
-
-;; GNU Emacs 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, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;;; Code:
-
-(require 'parse-time)
-
-(autoload 'timezone-make-date-arpa-standard "timezone")
-
-;;;###autoload
-(defun date-to-time (date)
- "Parse a string that represents a date-time and return a time value."
- (condition-case ()
- (apply 'encode-time
- (parse-time-string
- ;; `parse-time-string' isn't sufficiently general or
- ;; robust. It fails to grok some of the formats that
- ;; timezone does (e.g. dodgy post-2000 stuff from some
- ;; Elms) and either fails or returns bogus values. Lars
- ;; reverted this change, but that loses non-trivially
- ;; often for me. -- fx
- (timezone-make-date-arpa-standard date)))
- (error (error "Invalid date: %s" date))))
-
-(defun time-to-seconds (time)
- "Convert time value TIME to a floating point number.
-You can use `float-time' instead."
- (+ (* (car time) 65536.0)
- (cadr time)
- (/ (or (nth 2 time) 0) 1000000.0)))
-
-;;;###autoload
-(defun seconds-to-time (seconds)
- "Convert SECONDS (a floating point number) to a time value."
- (list (floor seconds 65536)
- (floor (mod seconds 65536))
- (floor (* (- seconds (ffloor seconds)) 1000000))))
-
-;;;###autoload
-(defun time-less-p (t1 t2)
- "Say whether time value T1 is less than time value T2."
- (or (< (car t1) (car t2))
- (and (= (car t1) (car t2))
- (< (nth 1 t1) (nth 1 t2)))))
-
-;;;###autoload
-(defun days-to-time (days)
- "Convert DAYS into a time value."
- (let* ((seconds (* 1.0 days 60 60 24))
- (rest (expt 2 16))
- (ms (condition-case nil (floor (/ seconds rest))
- (range-error (expt 2 16)))))
- (list ms (condition-case nil (round (- seconds (* ms rest)))
- (range-error (expt 2 16))))))
-
-;;;###autoload
-(defun time-since (time)
- "Return the time elapsed since TIME.
-TIME should be either a time value or a date-time string."
- (when (stringp time)
- ;; Convert date strings to internal time.
- (setq time (date-to-time time)))
- (let* ((current (current-time))
- (rest (when (< (nth 1 current) (nth 1 time))
- (expt 2 16))))
- (list (- (+ (car current) (if rest -1 0)) (car time))
- (- (+ (or rest 0) (nth 1 current)) (nth 1 time)))))
-
-;;;###autoload
-(defalias 'subtract-time 'time-subtract)
-
-;;;###autoload
-(defun time-subtract (t1 t2)
- "Subtract two time values.
-Return the difference in the format of a time value."
- (let ((borrow (< (cadr t1) (cadr t2))))
- (list (- (car t1) (car t2) (if borrow 1 0))
- (- (+ (if borrow 65536 0) (cadr t1)) (cadr t2)))))
-
-;;;###autoload
-(defun time-add (t1 t2)
- "Add two time values. One should represent a time difference."
- (let ((high (car t1))
- (low (if (consp (cdr t1)) (nth 1 t1) (cdr t1)))
- (micro (if (numberp (car-safe (cdr-safe (cdr t1))))
- (nth 2 t1)
- 0))
- (high2 (car t2))
- (low2 (if (consp (cdr t2)) (nth 1 t2) (cdr t2)))
- (micro2 (if (numberp (car-safe (cdr-safe (cdr t2))))
- (nth 2 t2)
- 0)))
- ;; Add
- (setq micro (+ micro micro2))
- (setq low (+ low low2))
- (setq high (+ high high2))
-
- ;; Normalize
- ;; `/' rounds towards zero while `mod' returns a positive number,
- ;; so we can't rely on (= a (+ (* 100 (/ a 100)) (mod a 100))).
- (setq low (+ low (/ micro 1000000) (if (< micro 0) -1 0)))
- (setq micro (mod micro 1000000))
- (setq high (+ high (/ low 65536) (if (< low 0) -1 0)))
- (setq low (logand low 65535))
-
- (list high low micro)))
-
-;;;###autoload
-(defun date-to-day (date)
- "Return the number of days between year 1 and DATE.
-DATE should be a date-time string."
- (time-to-days (date-to-time date)))
-
-;;;###autoload
-(defun days-between (date1 date2)
- "Return the number of days between DATE1 and DATE2.
-DATE1 and DATE2 should be date-time strings."
- (- (date-to-day date1) (date-to-day date2)))
-
-;;;###autoload
-(defun date-leap-year-p (year)
- "Return t if YEAR is a leap year."
- (or (and (zerop (% year 4))
- (not (zerop (% year 100))))
- (zerop (% year 400))))
-
-;;;###autoload
-(defun time-to-day-in-year (time)
- "Return the day number within the year of the date month/day/year."
- (let* ((tim (decode-time time))
- (month (nth 4 tim))
- (day (nth 3 tim))
- (year (nth 5 tim))
- (day-of-year (+ day (* 31 (1- month)))))
- (when (> month 2)
- (setq day-of-year (- day-of-year (/ (+ 23 (* 4 month)) 10)))
- (when (date-leap-year-p year)
- (setq day-of-year (1+ day-of-year))))
- day-of-year))
-
-;;;###autoload
-(defun time-to-days (time)
- "The number of days between the Gregorian date 0001-12-31bce and TIME.
-TIME should be a time value.
-The Gregorian date Sunday, December 31, 1bce is imaginary."
- (let* ((tim (decode-time time))
- (month (nth 4 tim))
- (day (nth 3 tim))
- (year (nth 5 tim)))
- (+ (time-to-day-in-year time) ; 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 time-to-number-of-days (time)
- "Return the number of days represented by TIME.
-The number of days will be returned as a floating point number."
- (/ (+ (* 1.0 65536 (car time)) (cadr time)) (* 60 60 24)))
-
-;;;###autoload
-(defun safe-date-to-time (date)
- "Parse a string that represents a date-time and return a time value.
-If DATE is malformed, return a time value of zeros."
- (condition-case ()
- (date-to-time date)
- (error '(0 0))))
-
-(provide 'time-date)
-
-;;; arch-tag: addcf07b-b20a-465b-af72-550b8ac5190f
-;;; time-date.el ends here
projects / emacs.git / commitdiff