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