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| 1 | +// Copyright (C) 2007, Fredrik Kuivinen <[email protected]> |
| 2 | +// 2007, Petr Baudis <[email protected]> |
| 3 | +// 2008-2011, Jakub Narebski <[email protected]> |
| 4 | + |
| 5 | +/** |
| 6 | + * @fileOverview Datetime manipulation: parsing and formatting |
| 7 | + * @license GPLv2 or later |
| 8 | + */ |
| 9 | + |
| 10 | + |
| 11 | +/* ............................................................ */ |
| 12 | +/* parsing and retrieving datetime related information */ |
| 13 | + |
| 14 | +/** |
| 15 | + * used to extract hours and minutes from timezone info, e.g '-0900' |
| 16 | + * @constant |
| 17 | + */ |
| 18 | +var tzRe = /^([+\-])([0-9][0-9])([0-9][0-9])$/; |
| 19 | + |
| 20 | +/** |
| 21 | + * convert numeric timezone +/-ZZZZ to offset from UTC in seconds |
| 22 | + * |
| 23 | + * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM' |
| 24 | + * @returns {Number} offset from UTC in seconds for timezone |
| 25 | + * |
| 26 | + * @globals tzRe |
| 27 | + */ |
| 28 | +function timezoneOffset(timezoneInfo) { |
| 29 | + var match = tzRe.exec(timezoneInfo); |
| 30 | + var tz_sign = (match[1] === '-' ? -1 : +1); |
| 31 | + var tz_hour = parseInt(match[2],10); |
| 32 | + var tz_min = parseInt(match[3],10); |
| 33 | + |
| 34 | + return tz_sign*(((tz_hour*60) + tz_min)*60); |
| 35 | +} |
| 36 | + |
| 37 | +/** |
| 38 | + * return local (browser) timezone as offset from UTC in seconds |
| 39 | + * |
| 40 | + * @returns {Number} offset from UTC in seconds for local timezone |
| 41 | + */ |
| 42 | +function localTimezoneOffset() { |
| 43 | + // getTimezoneOffset returns the time-zone offset from UTC, |
| 44 | + // in _minutes_, for the current locale |
| 45 | + return ((new Date()).getTimezoneOffset() * -60); |
| 46 | +} |
| 47 | + |
| 48 | +/** |
| 49 | + * return local (browser) timezone as numeric timezone '(+|-)HHMM' |
| 50 | + * |
| 51 | + * @returns {String} locat timezone as -/+ZZZZ |
| 52 | + */ |
| 53 | +function localTimezoneInfo() { |
| 54 | + var tzOffsetMinutes = (new Date()).getTimezoneOffset() * -1; |
| 55 | + |
| 56 | + return formatTimezoneInfo(0, tzOffsetMinutes); |
| 57 | +} |
| 58 | + |
| 59 | + |
| 60 | +/** |
| 61 | + * Parse RFC-2822 date into a Unix timestamp (into epoch) |
| 62 | + * |
| 63 | + * @param {String} date: date in RFC-2822 format, e.g. 'Thu, 21 Dec 2000 16:01:07 +0200' |
| 64 | + * @returns {Number} epoch i.e. seconds since '00:00:00 1970-01-01 UTC' |
| 65 | + */ |
| 66 | +function parseRFC2822Date(date) { |
| 67 | + // Date.parse accepts the IETF standard (RFC 1123 Section 5.2.14 and elsewhere) |
| 68 | + // date syntax, which is defined in RFC 2822 (obsoletes RFC 822) |
| 69 | + // and returns number of _milli_seconds since January 1, 1970, 00:00:00 UTC |
| 70 | + return Date.parse(date) / 1000; |
| 71 | +} |
| 72 | + |
| 73 | + |
| 74 | +/* ............................................................ */ |
| 75 | +/* formatting date */ |
| 76 | + |
| 77 | +/** |
| 78 | + * format timezone offset as numerical timezone '(+|-)HHMM' or '(+|-)HH:MM' |
| 79 | + * |
| 80 | + * @param {Number} hours: offset in hours, e.g. 2 for '+0200' |
| 81 | + * @param {Number} [minutes] offset in minutes, e.g. 30 for '-4030'; |
| 82 | + * it is split into hours if not 0 <= minutes < 60, |
| 83 | + * for example 1200 would give '+0100'; |
| 84 | + * defaults to 0 |
| 85 | + * @param {String} [sep] separator between hours and minutes part, |
| 86 | + * default is '', might be ':' for W3CDTF (rfc-3339) |
| 87 | + * @returns {String} timezone in '(+|-)HHMM' or '(+|-)HH:MM' format |
| 88 | + */ |
| 89 | +function formatTimezoneInfo(hours, minutes, sep) { |
| 90 | + minutes = minutes || 0; // to be able to use formatTimezoneInfo(hh) |
| 91 | + sep = sep || ''; // default format is +/-ZZZZ |
| 92 | + |
| 93 | + if (minutes < 0 || minutes > 59) { |
| 94 | + hours = minutes > 0 ? Math.floor(minutes / 60) : Math.ceil(minutes / 60); |
| 95 | + minutes = Math.abs(minutes - 60*hours); // sign of minutes is sign of hours |
| 96 | + // NOTE: this works correctly because there is no UTC-00:30 timezone |
| 97 | + } |
| 98 | + |
| 99 | + var tzSign = hours >= 0 ? '+' : '-'; |
| 100 | + if (hours < 0) { |
| 101 | + hours = -hours; // sign is stored in tzSign |
| 102 | + } |
| 103 | + |
| 104 | + return tzSign + padLeft(hours, 2, '0') + sep + padLeft(minutes, 2, '0'); |
| 105 | +} |
| 106 | + |
| 107 | +/** |
| 108 | + * return date in local time formatted in iso-8601 like format |
| 109 | + * 'yyyy-mm-dd HH:MM:SS +/-ZZZZ' e.g. '2005-08-07 21:49:46 +0200' |
| 110 | + * |
| 111 | + * @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC' |
| 112 | + * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM' |
| 113 | + * @returns {String} date in local time in iso-8601 like format |
| 114 | + */ |
| 115 | +function formatDateISOLocal(epoch, timezoneInfo) { |
| 116 | + // date corrected by timezone |
| 117 | + var localDate = new Date(1000 * (epoch + |
| 118 | + timezoneOffset(timezoneInfo))); |
| 119 | + var localDateStr = // e.g. '2005-08-07' |
| 120 | + localDate.getUTCFullYear() + '-' + |
| 121 | + padLeft(localDate.getUTCMonth()+1, 2, '0') + '-' + |
| 122 | + padLeft(localDate.getUTCDate(), 2, '0'); |
| 123 | + var localTimeStr = // e.g. '21:49:46' |
| 124 | + padLeft(localDate.getUTCHours(), 2, '0') + ':' + |
| 125 | + padLeft(localDate.getUTCMinutes(), 2, '0') + ':' + |
| 126 | + padLeft(localDate.getUTCSeconds(), 2, '0'); |
| 127 | + |
| 128 | + return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo; |
| 129 | +} |
| 130 | + |
| 131 | +/** |
| 132 | + * return date in local time formatted in rfc-2822 format |
| 133 | + * e.g. 'Thu, 21 Dec 2000 16:01:07 +0200' |
| 134 | + * |
| 135 | + * @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC' |
| 136 | + * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM' |
| 137 | + * @param {Boolean} [padDay] e.g. 'Sun, 07 Aug' if true, 'Sun, 7 Aug' otherwise |
| 138 | + * @returns {String} date in local time in rfc-2822 format |
| 139 | + */ |
| 140 | +function formatDateRFC2882(epoch, timezoneInfo, padDay) { |
| 141 | + // A short textual representation of a month, three letters |
| 142 | + var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; |
| 143 | + // A textual representation of a day, three letters |
| 144 | + var days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]; |
| 145 | + // date corrected by timezone |
| 146 | + var localDate = new Date(1000 * (epoch + |
| 147 | + timezoneOffset(timezoneInfo))); |
| 148 | + var localDateStr = // e.g. 'Sun, 7 Aug 2005' or 'Sun, 07 Aug 2005' |
| 149 | + days[localDate.getUTCDay()] + ', ' + |
| 150 | + (padDay ? padLeft(localDate.getUTCDate(),2,'0') : localDate.getUTCDate()) + ' ' + |
| 151 | + months[localDate.getUTCMonth()] + ' ' + |
| 152 | + localDate.getUTCFullYear(); |
| 153 | + var localTimeStr = // e.g. '21:49:46' |
| 154 | + padLeft(localDate.getUTCHours(), 2, '0') + ':' + |
| 155 | + padLeft(localDate.getUTCMinutes(), 2, '0') + ':' + |
| 156 | + padLeft(localDate.getUTCSeconds(), 2, '0'); |
| 157 | + |
| 158 | + return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo; |
| 159 | +} |
| 160 | + |
| 161 | +/* end of datetime.js */ |
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