893 lines
36 KiB
JavaScript
893 lines
36 KiB
JavaScript
// -----
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// The `timezoneJS.Date` object gives you full-blown timezone support, independent from the timezone set on the end-user's machine running the browser. It uses the Olson zoneinfo files for its timezone data.
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//
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// The constructor function and setter methods use proxy JavaScript Date objects behind the scenes, so you can use strings like '10/22/2006' with the constructor. You also get the same sensible wraparound behavior with numeric parameters (like setting a value of 14 for the month wraps around to the next March).
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//
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// The other significant difference from the built-in JavaScript Date is that `timezoneJS.Date` also has named properties that store the values of year, month, date, etc., so it can be directly serialized to JSON and used for data transfer.
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/*
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* Copyright 2010 Matthew Eernisse (mde@fleegix.org)
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* and Open Source Applications Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Credits: Ideas included from incomplete JS implementation of Olson
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* parser, "XMLDAte" by Philippe Goetz (philippe.goetz@wanadoo.fr)
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*
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* Contributions:
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* Jan Niehusmann
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* Ricky Romero
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* Preston Hunt (prestonhunt@gmail.com)
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* Dov. B Katz (dov.katz@morganstanley.com)
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* Peter Bergström (pbergstr@mac.com)
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* Long Ho
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*/
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(function () {
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// Standard initialization stuff to make sure the library is
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// usable on both client and server (node) side.
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var root = this;
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var timezoneJS;
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if (typeof exports !== 'undefined') {
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timezoneJS = exports;
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} else {
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timezoneJS = root.timezoneJS = {};
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}
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timezoneJS.VERSION = '1.0.0';
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// Grab the ajax library from global context.
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// This can be jQuery, Zepto or fleegix.
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// You can also specify your own transport mechanism by declaring
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// `timezoneJS.timezone.transport` to a `function`. More details will follow
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var $ = root.$ || root.jQuery || root.Zepto
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, fleegix = root.fleegix
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// Declare constant list of days and months. Unfortunately this doesn't leave room for i18n due to the Olson data being in English itself
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, DAYS = timezoneJS.Days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
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, MONTHS = timezoneJS.Months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
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, SHORT_MONTHS = {}
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, SHORT_DAYS = {}
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, EXACT_DATE_TIME = {}
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, TZ_REGEXP = new RegExp('^[a-zA-Z]+/');
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//`{ "Jan": 0, "Feb": 1, "Mar": 2, "Apr": 3, "May": 4, "Jun": 5, "Jul": 6, "Aug": 7, "Sep": 8, "Oct": 9, "Nov": 10, "Dec": 11 }`
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for (var i = 0; i < MONTHS.length; i++) {
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SHORT_MONTHS[MONTHS[i].substr(0, 3)] = i;
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}
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//`{ "Sun": 0, "Mon": 1, "Tue": 2, "Wed": 3, "Thu": 4, "Fri": 5, "Sat": 6 }`
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for (i = 0; i < DAYS.length; i++) {
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SHORT_DAYS[DAYS[i].substr(0, 3)] = i;
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}
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//Handle array indexOf in IE
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if (!Array.prototype.indexOf) {
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Array.prototype.indexOf = function (el) {
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for (var i = 0; i < this.length; i++ ) {
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if (el === this[i]) return i;
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}
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return -1;
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}
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}
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// Format a number to the length = digits. For ex:
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//
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// `_fixWidth(2, 2) = '02'`
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//
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// `_fixWidth(1998, 2) = '98'`
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//
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// This is used to pad numbers in converting date to string in ISO standard.
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var _fixWidth = function (number, digits) {
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if (typeof number !== "number") { throw "not a number: " + number; }
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var s = number.toString();
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if (number.length > digits) {
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return number.substr(number.length - digits, number.length);
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}
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while (s.length < digits) {
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s = '0' + s;
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}
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return s;
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};
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// Abstraction layer for different transport layers, including fleegix/jQuery/Zepto
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//
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// Object `opts` include
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//
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// - `url`: url to ajax query
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//
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// - `async`: true for asynchronous, false otherwise. If false, return value will be response from URL. This is true by default
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//
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// - `success`: success callback function
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//
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// - `error`: error callback function
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// Returns response from URL if async is false, otherwise the AJAX request object itself
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var _transport = function (opts) {
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if ((!fleegix || typeof fleegix.xhr === 'undefined') && (!$ || typeof $.ajax === 'undefined')) {
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throw new Error('Please use the Fleegix.js XHR module, jQuery ajax, Zepto ajax, or define your own transport mechanism for downloading zone files.');
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}
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if (!opts) return;
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if (!opts.url) throw new Error ('URL must be specified');
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if (!('async' in opts)) opts.async = true;
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if (!opts.async) {
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return fleegix && fleegix.xhr
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? fleegix.xhr.doReq({ url: opts.url, async: false })
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: $.ajax({ url : opts.url, async : false }).responseText;
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}
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return fleegix && fleegix.xhr
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? fleegix.xhr.send({
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url : opts.url,
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method : 'get',
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handleSuccess : opts.success,
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handleErr : opts.error
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})
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: $.ajax({
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url : opts.url,
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dataType: 'text',
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method : 'GET',
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error : opts.error,
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success : opts.success
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});
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};
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// Constructor, which is similar to that of the native Date object itself
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timezoneJS.Date = function () {
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var args = Array.prototype.slice.apply(arguments)
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, dt = null
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, tz = null
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, arr = [];
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//We support several different constructors, including all the ones from `Date` object
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// with a timezone string at the end.
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//
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//- `[tz]`: Returns object with time in `tz` specified.
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//
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// - `utcMillis`, `[tz]`: Return object with UTC time = `utcMillis`, in `tz`.
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//
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// - `Date`, `[tz]`: Returns object with UTC time = `Date.getTime()`, in `tz`.
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//
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// - `year, month, [date,] [hours,] [minutes,] [seconds,] [millis,] [tz]: Same as `Date` object
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// with tz.
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//
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// - `Array`: Can be any combo of the above.
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//
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//If 1st argument is an array, we can use it as a list of arguments itself
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if (Object.prototype.toString.call(args[0]) === '[object Array]') {
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args = args[0];
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}
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if (typeof args[args.length - 1] === 'string' && TZ_REGEXP.test(args[args.length - 1])) {
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tz = args.pop();
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}
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switch (args.length) {
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case 0:
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dt = new Date();
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break;
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case 1:
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dt = new Date(args[0]);
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break;
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default:
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for (var i = 0; i < 7; i++) {
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arr[i] = args[i] || 0;
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}
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dt = new Date(arr[0], arr[1], arr[2], arr[3], arr[4], arr[5], arr[6]);
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break;
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}
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this._useCache = false;
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this._tzInfo = {};
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this._day = 0;
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this.year = 0;
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this.month = 0;
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this.date = 0;
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this.hours = 0;
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this.minutes = 0;
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this.seconds = 0;
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this.milliseconds = 0;
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this.timezone = tz || null;
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//Tricky part:
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// For the cases where there are 1/2 arguments: `timezoneJS.Date(millis, [tz])` and `timezoneJS.Date(Date, [tz])`. The
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// Date `dt` created should be in UTC. Thus the way I detect such cases is to determine if `arr` is not populated & `tz`
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// is specified. Because if `tz` is not specified, `dt` can be in local time.
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if (arr.length) {
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this.setFromDateObjProxy(dt);
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} else {
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this.setFromTimeProxy(dt.getTime(), tz);
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}
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};
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// Implements most of the native Date object
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timezoneJS.Date.prototype = {
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getDate: function () { return this.date; },
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getDay: function () { return this._day; },
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getFullYear: function () { return this.year; },
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getMonth: function () { return this.month; },
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getYear: function () { return this.year; },
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getHours: function () { return this.hours; },
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getMilliseconds: function () { return this.milliseconds; },
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getMinutes: function () { return this.minutes; },
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getSeconds: function () { return this.seconds; },
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getUTCDate: function () { return this.getUTCDateProxy().getUTCDate(); },
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getUTCDay: function () { return this.getUTCDateProxy().getUTCDay(); },
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getUTCFullYear: function () { return this.getUTCDateProxy().getUTCFullYear(); },
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getUTCHours: function () { return this.getUTCDateProxy().getUTCHours(); },
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getUTCMilliseconds: function () { return this.getUTCDateProxy().getUTCMilliseconds(); },
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getUTCMinutes: function () { return this.getUTCDateProxy().getUTCMinutes(); },
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getUTCMonth: function () { return this.getUTCDateProxy().getUTCMonth(); },
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getUTCSeconds: function () { return this.getUTCDateProxy().getUTCSeconds(); },
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// Time adjusted to user-specified timezone
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getTime: function () {
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return this._timeProxy + (this.getTimezoneOffset() * 60 * 1000);
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},
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getTimezone: function () { return this.timezone; },
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getTimezoneOffset: function () { return this.getTimezoneInfo().tzOffset; },
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getTimezoneAbbreviation: function () { return this.getTimezoneInfo().tzAbbr; },
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getTimezoneInfo: function () {
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if (this._useCache) return this._tzInfo;
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var res;
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// If timezone is specified, get the correct timezone info based on the Date given
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if (this.timezone) {
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res = this.timezone === 'Etc/UTC' || this.timezone === 'Etc/GMT'
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? { tzOffset: 0, tzAbbr: 'UTC' }
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: timezoneJS.timezone.getTzInfo(this._timeProxy, this.timezone);
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}
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// If no timezone was specified, use the local browser offset
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else {
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res = { tzOffset: this.getLocalOffset(), tzAbbr: null };
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}
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this._tzInfo = res;
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this._useCache = true;
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return res
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},
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getUTCDateProxy: function () {
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var dt = new Date(this._timeProxy);
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dt.setUTCMinutes(dt.getUTCMinutes() + this.getTimezoneOffset());
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return dt;
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},
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setDate: function (n) { this.setAttribute('date', n); },
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setFullYear: function (n) { this.setAttribute('year', n); },
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setMonth: function (n) { this.setAttribute('month', n); },
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setYear: function (n) { this.setUTCAttribute('year', n); },
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setHours: function (n) { this.setAttribute('hours', n); },
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setMilliseconds: function (n) { this.setAttribute('milliseconds', n); },
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setMinutes: function (n) { this.setAttribute('minutes', n); },
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setSeconds: function (n) { this.setAttribute('seconds', n); },
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setTime: function (n) {
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if (isNaN(n)) { throw new Error('Units must be a number.'); }
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this.setFromTimeProxy(n, this.timezone);
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},
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setUTCDate: function (n) { this.setUTCAttribute('date', n); },
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setUTCFullYear: function (n) { this.setUTCAttribute('year', n); },
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setUTCHours: function (n) { this.setUTCAttribute('hours', n); },
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setUTCMilliseconds: function (n) { this.setUTCAttribute('milliseconds', n); },
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setUTCMinutes: function (n) { this.setUTCAttribute('minutes', n); },
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setUTCMonth: function (n) { this.setUTCAttribute('month', n); },
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setUTCSeconds: function (n) { this.setUTCAttribute('seconds', n); },
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setFromDateObjProxy: function (dt) {
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this.year = dt.getFullYear();
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this.month = dt.getMonth();
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this.date = dt.getDate();
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this.hours = dt.getHours();
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this.minutes = dt.getMinutes();
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this.seconds = dt.getSeconds();
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this.milliseconds = dt.getMilliseconds();
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this._day = dt.getDay();
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this._dateProxy = dt;
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this._timeProxy = Date.UTC(this.year, this.month, this.date, this.hours, this.minutes, this.seconds, this.milliseconds);
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this._useCache = false;
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},
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setFromTimeProxy: function (utcMillis, tz) {
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var dt = new Date(utcMillis);
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var tzOffset;
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tzOffset = tz ? timezoneJS.timezone.getTzInfo(dt, tz).tzOffset : dt.getTimezoneOffset();
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dt.setTime(utcMillis + (dt.getTimezoneOffset() - tzOffset) * 60000);
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this.setFromDateObjProxy(dt);
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},
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setAttribute: function (unit, n) {
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if (isNaN(n)) { throw new Error('Units must be a number.'); }
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var dt = this._dateProxy;
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var meth = unit === 'year' ? 'FullYear' : unit.substr(0, 1).toUpperCase() + unit.substr(1);
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dt['set' + meth](n);
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this.setFromDateObjProxy(dt);
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},
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setUTCAttribute: function (unit, n) {
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if (isNaN(n)) { throw new Error('Units must be a number.'); }
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var meth = unit === 'year' ? 'FullYear' : unit.substr(0, 1).toUpperCase() + unit.substr(1);
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var dt = this.getUTCDateProxy();
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dt['setUTC' + meth](n);
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dt.setUTCMinutes(dt.getUTCMinutes() - this.getTimezoneOffset());
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this.setFromTimeProxy(dt.getTime() + this.getTimezoneOffset() * 60000, this.timezone);
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},
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setTimezone: function (tz) {
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var previousOffset = this.getTimezoneInfo().tzOffset;
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this.timezone = tz;
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this._useCache = false;
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// Set UTC minutes offsets by the delta of the two timezones
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this.setUTCMinutes(this.getUTCMinutes() - this.getTimezoneInfo().tzOffset + previousOffset);
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},
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removeTimezone: function () {
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this.timezone = null;
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this._useCache = false;
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},
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valueOf: function () { return this.getTime(); },
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clone: function () {
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return this.timezone ? new timezoneJS.Date(this.getTime(), this.timezone) : new timezoneJS.Date(this.getTime());
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},
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toGMTString: function () { return this.toString('EEE, dd MMM yyyy HH:mm:ss Z', 'Etc/GMT'); },
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toLocaleString: function () {},
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toLocaleDateString: function () {},
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toLocaleTimeString: function () {},
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toSource: function () {},
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toISOString: function () { return this.toString('yyyy-MM-ddTHH:mm:ss.SSS', 'Etc/UTC') + 'Z'; },
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toJSON: function () { return this.toISOString(); },
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// Allows different format following ISO8601 format:
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toString: function (format, tz) {
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// Default format is the same as toISOString
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if (!format) format = 'yyyy-MM-dd HH:mm:ss';
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var result = format;
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var tzInfo = tz ? timezoneJS.timezone.getTzInfo(this.getTime(), tz) : this.getTimezoneInfo();
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var _this = this;
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// If timezone is specified, get a clone of the current Date object and modify it
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if (tz) {
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_this = this.clone();
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_this.setTimezone(tz);
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}
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var hours = _this.getHours();
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return result
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// fix the same characters in Month names
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.replace(/a+/g, function () { return 'k'; })
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// `y`: year
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.replace(/y+/g, function (token) { return _fixWidth(_this.getFullYear(), token.length); })
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// `d`: date
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.replace(/d+/g, function (token) { return _fixWidth(_this.getDate(), token.length); })
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// `m`: minute
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.replace(/m+/g, function (token) { return _fixWidth(_this.getMinutes(), token.length); })
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// `s`: second
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.replace(/s+/g, function (token) { return _fixWidth(_this.getSeconds(), token.length); })
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// `S`: millisecond
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.replace(/S+/g, function (token) { return _fixWidth(_this.getMilliseconds(), token.length); })
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// `M`: month. Note: `MM` will be the numeric representation (e.g February is 02) but `MMM` will be text representation (e.g February is Feb)
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.replace(/M+/g, function (token) {
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var _month = _this.getMonth(),
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_len = token.length;
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if (_len > 3) {
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return timezoneJS.Months[_month];
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} else if (_len > 2) {
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return timezoneJS.Months[_month].substring(0, _len);
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}
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return _fixWidth(_month + 1, _len);
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})
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// `k`: AM/PM
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.replace(/k+/g, function () {
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if (hours >= 12) {
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if (hours > 12) {
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hours -= 12;
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}
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return 'PM';
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}
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return 'AM';
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})
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// `H`: hour
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.replace(/H+/g, function (token) { return _fixWidth(hours, token.length); })
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// `E`: day
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.replace(/E+/g, function (token) { return DAYS[_this.getDay()].substring(0, token.length); })
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// `Z`: timezone abbreviation
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.replace(/Z+/gi, function () { return tzInfo.tzAbbr; });
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},
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toUTCString: function () { return this.toGMTString(); },
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civilToJulianDayNumber: function (y, m, d) {
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var a;
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// Adjust for zero-based JS-style array
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m++;
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if (m > 12) {
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a = parseInt(m/12, 10);
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m = m % 12;
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y += a;
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}
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if (m <= 2) {
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y -= 1;
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m += 12;
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}
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a = Math.floor(y / 100);
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var b = 2 - a + Math.floor(a / 4)
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, jDt = Math.floor(365.25 * (y + 4716)) + Math.floor(30.6001 * (m + 1)) + d + b - 1524;
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return jDt;
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},
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getLocalOffset: function () {
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return this._dateProxy.getTimezoneOffset();
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}
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};
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timezoneJS.timezone = new function () {
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var _this = this
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, regionMap = {'Etc':'etcetera','EST':'northamerica','MST':'northamerica','HST':'northamerica','EST5EDT':'northamerica','CST6CDT':'northamerica','MST7MDT':'northamerica','PST8PDT':'northamerica','America':'northamerica','Pacific':'australasia','Atlantic':'europe','Africa':'africa','Indian':'africa','Antarctica':'antarctica','Asia':'asia','Australia':'australasia','Europe':'europe','WET':'europe','CET':'europe','MET':'europe','EET':'europe'}
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, regionExceptions = {'Pacific/Honolulu':'northamerica','Atlantic/Bermuda':'northamerica','Atlantic/Cape_Verde':'africa','Atlantic/St_Helena':'africa','Indian/Kerguelen':'antarctica','Indian/Chagos':'asia','Indian/Maldives':'asia','Indian/Christmas':'australasia','Indian/Cocos':'australasia','America/Danmarkshavn':'europe','America/Scoresbysund':'europe','America/Godthab':'europe','America/Thule':'europe','Asia/Yekaterinburg':'europe','Asia/Omsk':'europe','Asia/Novosibirsk':'europe','Asia/Krasnoyarsk':'europe','Asia/Irkutsk':'europe','Asia/Yakutsk':'europe','Asia/Vladivostok':'europe','Asia/Sakhalin':'europe','Asia/Magadan':'europe','Asia/Kamchatka':'europe','Asia/Anadyr':'europe','Africa/Ceuta':'europe','America/Argentina/Buenos_Aires':'southamerica','America/Argentina/Cordoba':'southamerica','America/Argentina/Tucuman':'southamerica','America/Argentina/La_Rioja':'southamerica','America/Argentina/San_Juan':'southamerica','America/Argentina/Jujuy':'southamerica','America/Argentina/Catamarca':'southamerica','America/Argentina/Mendoza':'southamerica','America/Argentina/Rio_Gallegos':'southamerica','America/Argentina/Ushuaia':'southamerica','America/Aruba':'southamerica','America/La_Paz':'southamerica','America/Noronha':'southamerica','America/Belem':'southamerica','America/Fortaleza':'southamerica','America/Recife':'southamerica','America/Araguaina':'southamerica','America/Maceio':'southamerica','America/Bahia':'southamerica','America/Sao_Paulo':'southamerica','America/Campo_Grande':'southamerica','America/Cuiaba':'southamerica','America/Porto_Velho':'southamerica','America/Boa_Vista':'southamerica','America/Manaus':'southamerica','America/Eirunepe':'southamerica','America/Rio_Branco':'southamerica','America/Santiago':'southamerica','Pacific/Easter':'southamerica','America/Bogota':'southamerica','America/Curacao':'southamerica','America/Guayaquil':'southamerica','Pacific/Galapagos':'southamerica','Atlantic/Stanley':'southamerica','America/Cayenne':'southamerica','America/Guyana':'southamerica','America/Asuncion':'southamerica','America/Lima':'southamerica','Atlantic/South_Georgia':'southamerica','America/Paramaribo':'southamerica','America/Port_of_Spain':'southamerica','America/Montevideo':'southamerica','America/Caracas':'southamerica'};
|
|
function invalidTZError(t) { throw new Error('Timezone "' + t + '" is either incorrect, or not loaded in the timezone registry.'); }
|
|
function builtInLoadZoneFile(fileName, opts) {
|
|
var url = _this.zoneFileBasePath + '/' + fileName;
|
|
return !opts || !opts.async
|
|
? _this.parseZones(_this.transport({ url : url, async : false }))
|
|
: _this.transport({
|
|
async: true,
|
|
url : url,
|
|
success : function (str) {
|
|
if (_this.parseZones(str) && typeof opts.callback === 'function') {
|
|
opts.callback();
|
|
}
|
|
return true;
|
|
},
|
|
error : function () {
|
|
throw new Error('Error retrieving "' + url + '" zoneinfo files');
|
|
}
|
|
});
|
|
}
|
|
function getRegionForTimezone(tz) {
|
|
var exc = regionExceptions[tz]
|
|
, reg
|
|
, ret;
|
|
if (exc) return exc;
|
|
reg = tz.split('/')[0];
|
|
ret = regionMap[reg];
|
|
// If there's nothing listed in the main regions for this TZ, check the 'backward' links
|
|
if (ret) return ret;
|
|
var link = _this.zones[tz];
|
|
if (typeof link === 'string') {
|
|
return getRegionForTimezone(link);
|
|
}
|
|
// Backward-compat file hasn't loaded yet, try looking in there
|
|
if (!_this.loadedZones.backward) {
|
|
// This is for obvious legacy zones (e.g., Iceland) that don't even have a prefix like "America/" that look like normal zones
|
|
_this.loadZoneFile('backward');
|
|
return getRegionForTimezone(tz);
|
|
}
|
|
invalidTZError(tz);
|
|
}
|
|
function parseTimeString(str) {
|
|
var pat = /(\d+)(?::0*(\d*))?(?::0*(\d*))?([wsugz])?$/;
|
|
var hms = str.match(pat);
|
|
hms[1] = parseInt(hms[1], 10);
|
|
hms[2] = hms[2] ? parseInt(hms[2], 10) : 0;
|
|
hms[3] = hms[3] ? parseInt(hms[3], 10) : 0;
|
|
|
|
return hms;
|
|
}
|
|
function processZone(z) {
|
|
if (!z[3]) { return; }
|
|
var yea = parseInt(z[3], 10);
|
|
var mon = 11;
|
|
var dat = 31;
|
|
if (z[4]) {
|
|
mon = SHORT_MONTHS[z[4].substr(0, 3)];
|
|
dat = parseInt(z[5], 10) || 1;
|
|
}
|
|
var string = z[6] ? z[6] : '00:00:00'
|
|
, t = parseTimeString(string);
|
|
return [yea, mon, dat, t[1], t[2], t[3]];
|
|
}
|
|
function getZone(dt, tz) {
|
|
var utcMillis = typeof dt === 'number' ? dt : new Date(dt).getTime();
|
|
var t = tz;
|
|
var zoneList = _this.zones[t];
|
|
// Follow links to get to an actual zone
|
|
while (typeof zoneList === "string") {
|
|
t = zoneList;
|
|
zoneList = _this.zones[t];
|
|
}
|
|
if (!zoneList) {
|
|
// Backward-compat file hasn't loaded yet, try looking in there
|
|
if (!_this.loadedZones.backward) {
|
|
//This is for backward entries like "America/Fort_Wayne" that
|
|
// getRegionForTimezone *thinks* it has a region file and zone
|
|
// for (e.g., America => 'northamerica'), but in reality it's a
|
|
// legacy zone we need the backward file for.
|
|
_this.loadZoneFile('backward');
|
|
return getZone(dt, tz);
|
|
}
|
|
invalidTZError(t);
|
|
}
|
|
if (zoneList.length === 0) {
|
|
throw new Error('No Zone found for "' + tz + '" on ' + dt);
|
|
}
|
|
//Do backwards lookup since most use cases deal with newer dates.
|
|
for (var i = zoneList.length - 1; i >= 0; i--) {
|
|
var z = zoneList[i];
|
|
if (z[3] && utcMillis > z[3]) break;
|
|
}
|
|
return zoneList[i+1];
|
|
}
|
|
function getBasicOffset(time) {
|
|
var off = parseTimeString(time)
|
|
, adj = time.indexOf('-') === 0 ? -1 : 1;
|
|
off = adj * (((off[1] * 60 + off[2]) * 60 + off[3]) * 1000);
|
|
return off/60/1000;
|
|
}
|
|
|
|
//if isUTC is true, date is given in UTC, otherwise it's given
|
|
// in local time (ie. date.getUTC*() returns local time components)
|
|
function getRule(dt, zone, isUTC) {
|
|
var date = typeof dt === 'number' ? new Date(dt) : dt;
|
|
var ruleset = zone[1];
|
|
var basicOffset = zone[0];
|
|
|
|
//Convert a date to UTC. Depending on the 'type' parameter, the date
|
|
// parameter may be:
|
|
//
|
|
// - `u`, `g`, `z`: already UTC (no adjustment).
|
|
//
|
|
// - `s`: standard time (adjust for time zone offset but not for DST)
|
|
//
|
|
// - `w`: wall clock time (adjust for both time zone and DST offset).
|
|
//
|
|
// DST adjustment is done using the rule given as third argument.
|
|
var convertDateToUTC = function (date, type, rule) {
|
|
var offset = 0;
|
|
|
|
if (type === 'u' || type === 'g' || type === 'z') { // UTC
|
|
offset = 0;
|
|
} else if (type === 's') { // Standard Time
|
|
offset = basicOffset;
|
|
} else if (type === 'w' || !type) { // Wall Clock Time
|
|
offset = getAdjustedOffset(basicOffset, rule);
|
|
} else {
|
|
throw("unknown type " + type);
|
|
}
|
|
offset *= 60 * 1000; // to millis
|
|
|
|
return new Date(date.getTime() + offset);
|
|
};
|
|
|
|
//Step 1: Find applicable rules for this year.
|
|
//
|
|
//Step 2: Sort the rules by effective date.
|
|
//
|
|
//Step 3: Check requested date to see if a rule has yet taken effect this year. If not,
|
|
//
|
|
//Step 4: Get the rules for the previous year. If there isn't an applicable rule for last year, then
|
|
// there probably is no current time offset since they seem to explicitly turn off the offset
|
|
// when someone stops observing DST.
|
|
//
|
|
// FIXME if this is not the case and we'll walk all the way back (ugh).
|
|
//
|
|
//Step 5: Sort the rules by effective date.
|
|
//Step 6: Apply the most recent rule before the current time.
|
|
var convertRuleToExactDateAndTime = function (yearAndRule, prevRule) {
|
|
var year = yearAndRule[0]
|
|
, rule = yearAndRule[1];
|
|
// Assume that the rule applies to the year of the given date.
|
|
|
|
var hms = rule[5];
|
|
var effectiveDate;
|
|
|
|
if (!EXACT_DATE_TIME[year])
|
|
EXACT_DATE_TIME[year] = {};
|
|
|
|
// Result for given parameters is already stored
|
|
if (EXACT_DATE_TIME[year][rule])
|
|
effectiveDate = EXACT_DATE_TIME[year][rule];
|
|
else {
|
|
//If we have a specific date, use that!
|
|
if (!isNaN(rule[4])) {
|
|
effectiveDate = new Date(Date.UTC(year, SHORT_MONTHS[rule[3]], rule[4], hms[1], hms[2], hms[3], 0));
|
|
}
|
|
//Let's hunt for the date.
|
|
else {
|
|
var targetDay
|
|
, operator;
|
|
//Example: `lastThu`
|
|
if (rule[4].substr(0, 4) === "last") {
|
|
// Start at the last day of the month and work backward.
|
|
effectiveDate = new Date(Date.UTC(year, SHORT_MONTHS[rule[3]] + 1, 1, hms[1] - 24, hms[2], hms[3], 0));
|
|
targetDay = SHORT_DAYS[rule[4].substr(4, 3)];
|
|
operator = "<=";
|
|
}
|
|
//Example: `Sun>=15`
|
|
else {
|
|
//Start at the specified date.
|
|
effectiveDate = new Date(Date.UTC(year, SHORT_MONTHS[rule[3]], rule[4].substr(5), hms[1], hms[2], hms[3], 0));
|
|
targetDay = SHORT_DAYS[rule[4].substr(0, 3)];
|
|
operator = rule[4].substr(3, 2);
|
|
}
|
|
var ourDay = effectiveDate.getUTCDay();
|
|
//Go forwards.
|
|
if (operator === ">=") {
|
|
effectiveDate.setUTCDate(effectiveDate.getUTCDate() + (targetDay - ourDay + ((targetDay < ourDay) ? 7 : 0)));
|
|
}
|
|
//Go backwards. Looking for the last of a certain day, or operator is "<=" (less likely).
|
|
else {
|
|
effectiveDate.setUTCDate(effectiveDate.getUTCDate() + (targetDay - ourDay - ((targetDay > ourDay) ? 7 : 0)));
|
|
}
|
|
}
|
|
EXACT_DATE_TIME[year][rule] = effectiveDate;
|
|
}
|
|
|
|
|
|
//If previous rule is given, correct for the fact that the starting time of the current
|
|
// rule may be specified in local time.
|
|
if (prevRule) {
|
|
effectiveDate = convertDateToUTC(effectiveDate, hms[4], prevRule);
|
|
}
|
|
return effectiveDate;
|
|
};
|
|
|
|
var findApplicableRules = function (year, ruleset) {
|
|
var applicableRules = [];
|
|
for (var i = 0; ruleset && i < ruleset.length; i++) {
|
|
//Exclude future rules.
|
|
if (ruleset[i][0] <= year &&
|
|
(
|
|
// Date is in a set range.
|
|
ruleset[i][1] >= year ||
|
|
// Date is in an "only" year.
|
|
(ruleset[i][0] === year && ruleset[i][1] === "only") ||
|
|
//We're in a range from the start year to infinity.
|
|
ruleset[i][1] === "max"
|
|
)
|
|
) {
|
|
//It's completely okay to have any number of matches here.
|
|
// Normally we should only see two, but that doesn't preclude other numbers of matches.
|
|
// These matches are applicable to this year.
|
|
applicableRules.push([year, ruleset[i]]);
|
|
}
|
|
}
|
|
return applicableRules;
|
|
};
|
|
|
|
var compareDates = function (a, b, prev) {
|
|
var year, rule;
|
|
if (a.constructor !== Date) {
|
|
year = a[0];
|
|
rule = a[1];
|
|
a = (!prev && EXACT_DATE_TIME[year] && EXACT_DATE_TIME[year][rule])
|
|
? EXACT_DATE_TIME[year][rule]
|
|
: convertRuleToExactDateAndTime(a, prev);
|
|
} else if (prev) {
|
|
a = convertDateToUTC(a, isUTC ? 'u' : 'w', prev);
|
|
}
|
|
if (b.constructor !== Date) {
|
|
year = b[0];
|
|
rule = b[1];
|
|
b = (!prev && EXACT_DATE_TIME[year] && EXACT_DATE_TIME[year][rule]) ? EXACT_DATE_TIME[year][rule]
|
|
: convertRuleToExactDateAndTime(b, prev);
|
|
} else if (prev) {
|
|
b = convertDateToUTC(b, isUTC ? 'u' : 'w', prev);
|
|
}
|
|
a = Number(a);
|
|
b = Number(b);
|
|
return a - b;
|
|
};
|
|
|
|
var year = date.getUTCFullYear();
|
|
var applicableRules;
|
|
|
|
applicableRules = findApplicableRules(year, _this.rules[ruleset]);
|
|
applicableRules.push(date);
|
|
//While sorting, the time zone in which the rule starting time is specified
|
|
// is ignored. This is ok as long as the timespan between two DST changes is
|
|
// larger than the DST offset, which is probably always true.
|
|
// As the given date may indeed be close to a DST change, it may get sorted
|
|
// to a wrong position (off by one), which is corrected below.
|
|
applicableRules.sort(compareDates);
|
|
|
|
//If there are not enough past DST rules...
|
|
if (applicableRules.indexOf(date) < 2) {
|
|
applicableRules = applicableRules.concat(findApplicableRules(year-1, _this.rules[ruleset]));
|
|
applicableRules.sort(compareDates);
|
|
}
|
|
var pinpoint = applicableRules.indexOf(date);
|
|
if (pinpoint > 1 && compareDates(date, applicableRules[pinpoint-1], applicableRules[pinpoint-2][1]) < 0) {
|
|
//The previous rule does not really apply, take the one before that.
|
|
return applicableRules[pinpoint - 2][1];
|
|
} else if (pinpoint > 0 && pinpoint < applicableRules.length - 1 && compareDates(date, applicableRules[pinpoint+1], applicableRules[pinpoint-1][1]) > 0) {
|
|
|
|
//The next rule does already apply, take that one.
|
|
return applicableRules[pinpoint + 1][1];
|
|
} else if (pinpoint === 0) {
|
|
//No applicable rule found in this and in previous year.
|
|
return null;
|
|
}
|
|
return applicableRules[pinpoint - 1][1];
|
|
}
|
|
function getAdjustedOffset(off, rule) {
|
|
return -Math.ceil(rule[6] - off);
|
|
}
|
|
function getAbbreviation(zone, rule) {
|
|
var res;
|
|
var base = zone[2];
|
|
if (base.indexOf('%s') > -1) {
|
|
var repl;
|
|
if (rule) {
|
|
repl = rule[7] === '-' ? '' : rule[7];
|
|
}
|
|
//FIXME: Right now just falling back to Standard --
|
|
// apparently ought to use the last valid rule,
|
|
// although in practice that always ought to be Standard
|
|
else {
|
|
repl = 'S';
|
|
}
|
|
res = base.replace('%s', repl);
|
|
}
|
|
else if (base.indexOf('/') > -1) {
|
|
//Chose one of two alternative strings.
|
|
res = base.split("/", 2)[rule[6] ? 1 : 0];
|
|
} else {
|
|
res = base;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
this.zoneFileBasePath;
|
|
this.zoneFiles = ['africa', 'antarctica', 'asia', 'australasia', 'backward', 'etcetera', 'europe', 'northamerica', 'pacificnew', 'southamerica'];
|
|
this.loadingSchemes = {
|
|
PRELOAD_ALL: 'preloadAll',
|
|
LAZY_LOAD: 'lazyLoad',
|
|
MANUAL_LOAD: 'manualLoad'
|
|
};
|
|
this.loadingScheme = this.loadingSchemes.LAZY_LOAD;
|
|
this.loadedZones = {};
|
|
this.zones = {};
|
|
this.rules = {};
|
|
|
|
this.init = function (o) {
|
|
var opts = { async: true }
|
|
, def = this.defaultZoneFile = this.loadingScheme === this.loadingSchemes.PRELOAD_ALL
|
|
? this.zoneFiles
|
|
: 'northamerica'
|
|
, done = 0
|
|
, callbackFn;
|
|
//Override default with any passed-in opts
|
|
for (var p in o) {
|
|
opts[p] = o[p];
|
|
}
|
|
if (typeof def === 'string') {
|
|
return this.loadZoneFile(def, opts);
|
|
}
|
|
//Wraps callback function in another one that makes
|
|
// sure all files have been loaded.
|
|
callbackFn = opts.callback;
|
|
opts.callback = function () {
|
|
done++;
|
|
(done === def.length) && typeof callbackFn === 'function' && callbackFn();
|
|
};
|
|
for (var i = 0; i < def.length; i++) {
|
|
this.loadZoneFile(def[i], opts);
|
|
}
|
|
};
|
|
|
|
//Get the zone files via XHR -- if the sync flag
|
|
// is set to true, it's being called by the lazy-loading
|
|
// mechanism, so the result needs to be returned inline.
|
|
this.loadZoneFile = function (fileName, opts) {
|
|
if (typeof this.zoneFileBasePath === 'undefined') {
|
|
throw new Error('Please define a base path to your zone file directory -- timezoneJS.timezone.zoneFileBasePath.');
|
|
}
|
|
//Ignore already loaded zones.
|
|
if (this.loadedZones[fileName]) {
|
|
return;
|
|
}
|
|
this.loadedZones[fileName] = true;
|
|
return builtInLoadZoneFile(fileName, opts);
|
|
};
|
|
this.loadZoneJSONData = function (url, sync) {
|
|
var processData = function (data) {
|
|
data = eval('('+ data +')');
|
|
for (var z in data.zones) {
|
|
_this.zones[z] = data.zones[z];
|
|
}
|
|
for (var r in data.rules) {
|
|
_this.rules[r] = data.rules[r];
|
|
}
|
|
};
|
|
return sync
|
|
? processData(_this.transport({ url : url, async : false }))
|
|
: _this.transport({ url : url, success : processData });
|
|
};
|
|
this.loadZoneDataFromObject = function (data) {
|
|
if (!data) { return; }
|
|
for (var z in data.zones) {
|
|
_this.zones[z] = data.zones[z];
|
|
}
|
|
for (var r in data.rules) {
|
|
_this.rules[r] = data.rules[r];
|
|
}
|
|
};
|
|
this.getAllZones = function () {
|
|
var arr = [];
|
|
for (var z in this.zones) { arr.push(z); }
|
|
return arr.sort();
|
|
};
|
|
this.parseZones = function (str) {
|
|
var lines = str.split('\n')
|
|
, arr = []
|
|
, chunk = ''
|
|
, l
|
|
, zone = null
|
|
, rule = null;
|
|
for (var i = 0; i < lines.length; i++) {
|
|
l = lines[i];
|
|
if (l.match(/^\s/)) {
|
|
l = "Zone " + zone + l;
|
|
}
|
|
l = l.split("#")[0];
|
|
if (l.length > 3) {
|
|
arr = l.split(/\s+/);
|
|
chunk = arr.shift();
|
|
//Ignore Leap.
|
|
switch (chunk) {
|
|
case 'Zone':
|
|
zone = arr.shift();
|
|
if (!_this.zones[zone]) {
|
|
_this.zones[zone] = [];
|
|
}
|
|
if (arr.length < 3) break;
|
|
//Process zone right here and replace 3rd element with the processed array.
|
|
arr.splice(3, arr.length, processZone(arr));
|
|
if (arr[3]) arr[3] = Date.UTC.apply(null, arr[3]);
|
|
arr[0] = -getBasicOffset(arr[0]);
|
|
_this.zones[zone].push(arr);
|
|
break;
|
|
case 'Rule':
|
|
rule = arr.shift();
|
|
if (!_this.rules[rule]) {
|
|
_this.rules[rule] = [];
|
|
}
|
|
//Parse int FROM year and TO year
|
|
arr[0] = parseInt(arr[0], 10);
|
|
arr[1] = parseInt(arr[1], 10) || arr[1];
|
|
//Parse time string AT
|
|
arr[5] = parseTimeString(arr[5]);
|
|
//Parse offset SAVE
|
|
arr[6] = getBasicOffset(arr[6]);
|
|
_this.rules[rule].push(arr);
|
|
break;
|
|
case 'Link':
|
|
//No zones for these should already exist.
|
|
if (_this.zones[arr[1]]) {
|
|
throw new Error('Error with Link ' + arr[1] + '. Cannot create link of a preexisted zone.');
|
|
}
|
|
//Create the link.
|
|
_this.zones[arr[1]] = arr[0];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
//Expose transport mechanism and allow overwrite.
|
|
this.transport = _transport;
|
|
this.getTzInfo = function (dt, tz, isUTC) {
|
|
//Lazy-load any zones not yet loaded.
|
|
if (this.loadingScheme === this.loadingSchemes.LAZY_LOAD) {
|
|
//Get the correct region for the zone.
|
|
var zoneFile = getRegionForTimezone(tz);
|
|
if (!zoneFile) {
|
|
throw new Error('Not a valid timezone ID.');
|
|
}
|
|
if (!this.loadedZones[zoneFile]) {
|
|
//Get the file and parse it -- use synchronous XHR.
|
|
this.loadZoneFile(zoneFile);
|
|
}
|
|
}
|
|
var z = getZone(dt, tz);
|
|
var off = z[0];
|
|
//See if the offset needs adjustment.
|
|
var rule = getRule(dt, z, isUTC);
|
|
if (rule) {
|
|
off = getAdjustedOffset(off, rule);
|
|
}
|
|
var abbr = getAbbreviation(z, rule);
|
|
return { tzOffset: off, tzAbbr: abbr };
|
|
};
|
|
};
|
|
}).call(this);
|