1b593e1ea4
git-subtree-dir: third_party/git git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7
176 lines
6 KiB
JavaScript
176 lines
6 KiB
JavaScript
// Copyright (C) 2007, Fredrik Kuivinen <frekui@gmail.com>
|
|
// 2007, Petr Baudis <pasky@suse.cz>
|
|
// 2008-2011, Jakub Narebski <jnareb@gmail.com>
|
|
|
|
/**
|
|
* @fileOverview Datetime manipulation: parsing and formatting
|
|
* @license GPLv2 or later
|
|
*/
|
|
|
|
|
|
/* ............................................................ */
|
|
/* parsing and retrieving datetime related information */
|
|
|
|
/**
|
|
* used to extract hours and minutes from timezone info, e.g '-0900'
|
|
* @constant
|
|
*/
|
|
var tzRe = /^([+\-])([0-9][0-9])([0-9][0-9])$/;
|
|
|
|
/**
|
|
* convert numeric timezone +/-ZZZZ to offset from UTC in seconds
|
|
*
|
|
* @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
|
|
* @returns {Number} offset from UTC in seconds for timezone
|
|
*
|
|
* @globals tzRe
|
|
*/
|
|
function timezoneOffset(timezoneInfo) {
|
|
var match = tzRe.exec(timezoneInfo);
|
|
var tz_sign = (match[1] === '-' ? -1 : +1);
|
|
var tz_hour = parseInt(match[2],10);
|
|
var tz_min = parseInt(match[3],10);
|
|
|
|
return tz_sign*(((tz_hour*60) + tz_min)*60);
|
|
}
|
|
|
|
/**
|
|
* return local (browser) timezone as offset from UTC in seconds
|
|
*
|
|
* @returns {Number} offset from UTC in seconds for local timezone
|
|
*/
|
|
function localTimezoneOffset() {
|
|
// getTimezoneOffset returns the time-zone offset from UTC,
|
|
// in _minutes_, for the current locale
|
|
return ((new Date()).getTimezoneOffset() * -60);
|
|
}
|
|
|
|
/**
|
|
* return local (browser) timezone as numeric timezone '(+|-)HHMM'
|
|
*
|
|
* @returns {String} locat timezone as -/+ZZZZ
|
|
*/
|
|
function localTimezoneInfo() {
|
|
var tzOffsetMinutes = (new Date()).getTimezoneOffset() * -1;
|
|
|
|
return formatTimezoneInfo(0, tzOffsetMinutes);
|
|
}
|
|
|
|
|
|
/**
|
|
* Parse RFC-2822 date into a Unix timestamp (into epoch)
|
|
*
|
|
* @param {String} date: date in RFC-2822 format, e.g. 'Thu, 21 Dec 2000 16:01:07 +0200'
|
|
* @returns {Number} epoch i.e. seconds since '00:00:00 1970-01-01 UTC'
|
|
*/
|
|
function parseRFC2822Date(date) {
|
|
// Date.parse accepts the IETF standard (RFC 1123 Section 5.2.14 and elsewhere)
|
|
// date syntax, which is defined in RFC 2822 (obsoletes RFC 822)
|
|
// and returns number of _milli_seconds since January 1, 1970, 00:00:00 UTC
|
|
return Date.parse(date) / 1000;
|
|
}
|
|
|
|
|
|
/* ............................................................ */
|
|
/* formatting date */
|
|
|
|
/**
|
|
* format timezone offset as numerical timezone '(+|-)HHMM' or '(+|-)HH:MM'
|
|
*
|
|
* @param {Number} hours: offset in hours, e.g. 2 for '+0200'
|
|
* @param {Number} [minutes] offset in minutes, e.g. 30 for '-4030';
|
|
* it is split into hours if not 0 <= minutes < 60,
|
|
* for example 1200 would give '+0100';
|
|
* defaults to 0
|
|
* @param {String} [sep] separator between hours and minutes part,
|
|
* default is '', might be ':' for W3CDTF (rfc-3339)
|
|
* @returns {String} timezone in '(+|-)HHMM' or '(+|-)HH:MM' format
|
|
*/
|
|
function formatTimezoneInfo(hours, minutes, sep) {
|
|
minutes = minutes || 0; // to be able to use formatTimezoneInfo(hh)
|
|
sep = sep || ''; // default format is +/-ZZZZ
|
|
|
|
if (minutes < 0 || minutes > 59) {
|
|
hours = minutes > 0 ? Math.floor(minutes / 60) : Math.ceil(minutes / 60);
|
|
minutes = Math.abs(minutes - 60*hours); // sign of minutes is sign of hours
|
|
// NOTE: this works correctly because there is no UTC-00:30 timezone
|
|
}
|
|
|
|
var tzSign = hours >= 0 ? '+' : '-';
|
|
if (hours < 0) {
|
|
hours = -hours; // sign is stored in tzSign
|
|
}
|
|
|
|
return tzSign + padLeft(hours, 2, '0') + sep + padLeft(minutes, 2, '0');
|
|
}
|
|
|
|
/**
|
|
* translate 'utc' and 'local' to numerical timezone
|
|
* @param {String} timezoneInfo: might be 'utc' or 'local' (browser)
|
|
*/
|
|
function normalizeTimezoneInfo(timezoneInfo) {
|
|
switch (timezoneInfo) {
|
|
case 'utc':
|
|
return '+0000';
|
|
case 'local': // 'local' is browser timezone
|
|
return localTimezoneInfo();
|
|
}
|
|
return timezoneInfo;
|
|
}
|
|
|
|
|
|
/**
|
|
* return date in local time formatted in iso-8601 like format
|
|
* 'yyyy-mm-dd HH:MM:SS +/-ZZZZ' e.g. '2005-08-07 21:49:46 +0200'
|
|
*
|
|
* @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC'
|
|
* @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
|
|
* @returns {String} date in local time in iso-8601 like format
|
|
*/
|
|
function formatDateISOLocal(epoch, timezoneInfo) {
|
|
// date corrected by timezone
|
|
var localDate = new Date(1000 * (epoch +
|
|
timezoneOffset(timezoneInfo)));
|
|
var localDateStr = // e.g. '2005-08-07'
|
|
localDate.getUTCFullYear() + '-' +
|
|
padLeft(localDate.getUTCMonth()+1, 2, '0') + '-' +
|
|
padLeft(localDate.getUTCDate(), 2, '0');
|
|
var localTimeStr = // e.g. '21:49:46'
|
|
padLeft(localDate.getUTCHours(), 2, '0') + ':' +
|
|
padLeft(localDate.getUTCMinutes(), 2, '0') + ':' +
|
|
padLeft(localDate.getUTCSeconds(), 2, '0');
|
|
|
|
return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo;
|
|
}
|
|
|
|
/**
|
|
* return date in local time formatted in rfc-2822 format
|
|
* e.g. 'Thu, 21 Dec 2000 16:01:07 +0200'
|
|
*
|
|
* @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC'
|
|
* @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
|
|
* @param {Boolean} [padDay] e.g. 'Sun, 07 Aug' if true, 'Sun, 7 Aug' otherwise
|
|
* @returns {String} date in local time in rfc-2822 format
|
|
*/
|
|
function formatDateRFC2882(epoch, timezoneInfo, padDay) {
|
|
// A short textual representation of a month, three letters
|
|
var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
|
|
// A textual representation of a day, three letters
|
|
var days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
|
|
// date corrected by timezone
|
|
var localDate = new Date(1000 * (epoch +
|
|
timezoneOffset(timezoneInfo)));
|
|
var localDateStr = // e.g. 'Sun, 7 Aug 2005' or 'Sun, 07 Aug 2005'
|
|
days[localDate.getUTCDay()] + ', ' +
|
|
(padDay ? padLeft(localDate.getUTCDate(),2,'0') : localDate.getUTCDate()) + ' ' +
|
|
months[localDate.getUTCMonth()] + ' ' +
|
|
localDate.getUTCFullYear();
|
|
var localTimeStr = // e.g. '21:49:46'
|
|
padLeft(localDate.getUTCHours(), 2, '0') + ':' +
|
|
padLeft(localDate.getUTCMinutes(), 2, '0') + ':' +
|
|
padLeft(localDate.getUTCSeconds(), 2, '0');
|
|
|
|
return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo;
|
|
}
|
|
|
|
/* end of datetime.js */
|