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-/**
- * This script gives you the zone info key representing your device's time zone setting.
- *
- * @name jsTimezoneDetect
- * @version 1.0.5
- * @author Jon Nylander
- * @license MIT License - http://www.opensource.org/licenses/mit-license.php
- *
- * For usage and examples, visit:
- * http://pellepim.bitbucket.org/jstz/
- *
- * Copyright (c) Jon Nylander
- */
-
-/*jslint undef: true */
-/*global console, exports*/
-
-(function(root) {
- /**
- * Namespace to hold all the code for timezone detection.
- */
- var jstz = (function () {
- 'use strict';
- var HEMISPHERE_SOUTH = 's',
-
- /**
- * Gets the offset in minutes from UTC for a certain date.
- * @param {Date} date
- * @returns {Number}
- */
- get_date_offset = function (date) {
- var offset = -date.getTimezoneOffset();
- return (offset !== null ? offset : 0);
- },
-
- get_date = function (year, month, date) {
- var d = new Date();
- if (year !== undefined) {
- d.setFullYear(year);
- }
- d.setMonth(month);
- d.setDate(date);
- return d;
- },
-
- get_january_offset = function (year) {
- return get_date_offset(get_date(year, 0 ,2));
- },
-
- get_june_offset = function (year) {
- return get_date_offset(get_date(year, 5, 2));
- },
-
- /**
- * Private method.
- * Checks whether a given date is in daylight saving time.
- * If the date supplied is after august, we assume that we're checking
- * for southern hemisphere DST.
- * @param {Date} date
- * @returns {Boolean}
- */
- date_is_dst = function (date) {
- var is_southern = date.getMonth() > 7,
- base_offset = is_southern ? get_june_offset(date.getFullYear()) :
- get_january_offset(date.getFullYear()),
- date_offset = get_date_offset(date),
- is_west = base_offset < 0,
- dst_offset = base_offset - date_offset;
-
- if (!is_west && !is_southern) {
- return dst_offset < 0;
- }
-
- return dst_offset !== 0;
- },
-
- /**
- * This function does some basic calculations to create information about
- * the user's timezone. It uses REFERENCE_YEAR as a solid year for which
- * the script has been tested rather than depend on the year set by the
- * client device.
- *
- * Returns a key that can be used to do lookups in jstz.olson.timezones.
- * eg: "720,1,2".
- *
- * @returns {String}
- */
-
- lookup_key = function () {
- var january_offset = get_january_offset(),
- june_offset = get_june_offset(),
- diff = january_offset - june_offset;
-
- if (diff < 0) {
- return january_offset + ",1";
- } else if (diff > 0) {
- return june_offset + ",1," + HEMISPHERE_SOUTH;
- }
-
- return january_offset + ",0";
- },
-
- /**
- * Uses get_timezone_info() to formulate a key to use in the olson.timezones dictionary.
- *
- * Returns a primitive object on the format:
- * {'timezone': TimeZone, 'key' : 'the key used to find the TimeZone object'}
- *
- * @returns Object
- */
- determine = function () {
- var key = lookup_key();
- return new jstz.TimeZone(jstz.olson.timezones[key]);
- },
-
- /**
- * This object contains information on when daylight savings starts for
- * different timezones.
- *
- * The list is short for a reason. Often we do not have to be very specific
- * to single out the correct timezone. But when we do, this list comes in
- * handy.
- *
- * Each value is a date denoting when daylight savings starts for that timezone.
- */
- dst_start_for = function (tz_name) {
-
- var ru_pre_dst_change = new Date(2010, 6, 15, 1, 0, 0, 0), // In 2010 Russia had DST, this allows us to detect Russia :)
- dst_starts = {
- 'America/Denver': new Date(2011, 2, 13, 3, 0, 0, 0),
- 'America/Mazatlan': new Date(2011, 3, 3, 3, 0, 0, 0),
- 'America/Chicago': new Date(2011, 2, 13, 3, 0, 0, 0),
- 'America/Mexico_City': new Date(2011, 3, 3, 3, 0, 0, 0),
- 'America/Asuncion': new Date(2012, 9, 7, 3, 0, 0, 0),
- 'America/Santiago': new Date(2012, 9, 3, 3, 0, 0, 0),
- 'America/Campo_Grande': new Date(2012, 9, 21, 5, 0, 0, 0),
- 'America/Montevideo': new Date(2011, 9, 2, 3, 0, 0, 0),
- 'America/Sao_Paulo': new Date(2011, 9, 16, 5, 0, 0, 0),
- 'America/Los_Angeles': new Date(2011, 2, 13, 8, 0, 0, 0),
- 'America/Santa_Isabel': new Date(2011, 3, 5, 8, 0, 0, 0),
- 'America/Havana': new Date(2012, 2, 10, 2, 0, 0, 0),
- 'America/New_York': new Date(2012, 2, 10, 7, 0, 0, 0),
- 'Europe/Helsinki': new Date(2013, 2, 31, 5, 0, 0, 0),
- 'Pacific/Auckland': new Date(2011, 8, 26, 7, 0, 0, 0),
- 'America/Halifax': new Date(2011, 2, 13, 6, 0, 0, 0),
- 'America/Goose_Bay': new Date(2011, 2, 13, 2, 1, 0, 0),
- 'America/Miquelon': new Date(2011, 2, 13, 5, 0, 0, 0),
- 'America/Godthab': new Date(2011, 2, 27, 1, 0, 0, 0),
- 'Europe/Moscow': ru_pre_dst_change,
- 'Asia/Amman': new Date(2013, 2, 29, 1, 0, 0, 0),
- 'Asia/Beirut': new Date(2013, 2, 31, 2, 0, 0, 0),
- 'Asia/Damascus': new Date(2013, 3, 6, 2, 0, 0, 0),
- 'Asia/Jerusalem': new Date(2013, 2, 29, 5, 0, 0, 0),
- 'Asia/Yekaterinburg': ru_pre_dst_change,
- 'Asia/Omsk': ru_pre_dst_change,
- 'Asia/Krasnoyarsk': ru_pre_dst_change,
- 'Asia/Irkutsk': ru_pre_dst_change,
- 'Asia/Yakutsk': ru_pre_dst_change,
- 'Asia/Vladivostok': ru_pre_dst_change,
- 'Asia/Baku': new Date(2013, 2, 31, 4, 0, 0),
- 'Asia/Yerevan': new Date(2013, 2, 31, 3, 0, 0),
- 'Asia/Kamchatka': ru_pre_dst_change,
- 'Asia/Gaza': new Date(2010, 2, 27, 4, 0, 0),
- 'Africa/Cairo': new Date(2010, 4, 1, 3, 0, 0),
- 'Europe/Minsk': ru_pre_dst_change,
- 'Pacific/Apia': new Date(2010, 10, 1, 1, 0, 0, 0),
- 'Pacific/Fiji': new Date(2010, 11, 1, 0, 0, 0),
- 'Australia/Perth': new Date(2008, 10, 1, 1, 0, 0, 0)
- };
-
- return dst_starts[tz_name];
- };
-
- return {
- determine: determine,
- date_is_dst: date_is_dst,
- dst_start_for: dst_start_for
- };
- }());
-
- /**
- * Simple object to perform ambiguity check and to return name of time zone.
- */
- jstz.TimeZone = function (tz_name) {
- 'use strict';
- /**
- * The keys in this object are timezones that we know may be ambiguous after
- * a preliminary scan through the olson_tz object.
- *
- * The array of timezones to compare must be in the order that daylight savings
- * starts for the regions.
- */
- var AMBIGUITIES = {
- 'America/Denver': ['America/Denver', 'America/Mazatlan'],
- 'America/Chicago': ['America/Chicago', 'America/Mexico_City'],
- 'America/Santiago': ['America/Santiago', 'America/Asuncion', 'America/Campo_Grande'],
- 'America/Montevideo': ['America/Montevideo', 'America/Sao_Paulo'],
- 'Asia/Beirut': ['Asia/Amman', 'Asia/Jerusalem', 'Asia/Beirut', 'Europe/Helsinki','Asia/Damascus'],
- 'Pacific/Auckland': ['Pacific/Auckland', 'Pacific/Fiji'],
- 'America/Los_Angeles': ['America/Los_Angeles', 'America/Santa_Isabel'],
- 'America/New_York': ['America/Havana', 'America/New_York'],
- 'America/Halifax': ['America/Goose_Bay', 'America/Halifax'],
- 'America/Godthab': ['America/Miquelon', 'America/Godthab'],
- 'Asia/Dubai': ['Europe/Moscow'],
- 'Asia/Dhaka': ['Asia/Yekaterinburg'],
- 'Asia/Jakarta': ['Asia/Omsk'],
- 'Asia/Shanghai': ['Asia/Krasnoyarsk', 'Australia/Perth'],
- 'Asia/Tokyo': ['Asia/Irkutsk'],
- 'Australia/Brisbane': ['Asia/Yakutsk'],
- 'Pacific/Noumea': ['Asia/Vladivostok'],
- 'Pacific/Tarawa': ['Asia/Kamchatka', 'Pacific/Fiji'],
- 'Pacific/Tongatapu': ['Pacific/Apia'],
- 'Asia/Baghdad': ['Europe/Minsk'],
- 'Asia/Baku': ['Asia/Yerevan','Asia/Baku'],
- 'Africa/Johannesburg': ['Asia/Gaza', 'Africa/Cairo']
- },
-
- timezone_name = tz_name,
-
- /**
- * Checks if a timezone has possible ambiguities. I.e timezones that are similar.
- *
- * For example, if the preliminary scan determines that we're in America/Denver.
- * We double check here that we're really there and not in America/Mazatlan.
- *
- * This is done by checking known dates for when daylight savings start for different
- * timezones during 2010 and 2011.
- */
- ambiguity_check = function () {
- var ambiguity_list = AMBIGUITIES[timezone_name],
- length = ambiguity_list.length,
- i = 0,
- tz = ambiguity_list[0];
-
- for (; i < length; i += 1) {
- tz = ambiguity_list[i];
-
- if (jstz.date_is_dst(jstz.dst_start_for(tz))) {
- timezone_name = tz;
- return;
- }
- }
- },
-
- /**
- * Checks if it is possible that the timezone is ambiguous.
- */
- is_ambiguous = function () {
- return typeof (AMBIGUITIES[timezone_name]) !== 'undefined';
- };
-
- if (is_ambiguous()) {
- ambiguity_check();
- }
-
- return {
- name: function () {
- return timezone_name;
- }
- };
- };
-
- jstz.olson = {};
-
- /*
- * The keys in this dictionary are comma separated as such:
- *
- * First the offset compared to UTC time in minutes.
- *
- * Then a flag which is 0 if the timezone does not take daylight savings into account and 1 if it
- * does.
- *
- * Thirdly an optional 's' signifies that the timezone is in the southern hemisphere,
- * only interesting for timezones with DST.
- *
- * The mapped arrays is used for constructing the jstz.TimeZone object from within
- * jstz.determine_timezone();
- */
- jstz.olson.timezones = {
- '-720,0' : 'Pacific/Majuro',
- '-660,0' : 'Pacific/Pago_Pago',
- '-600,1' : 'America/Adak',
- '-600,0' : 'Pacific/Honolulu',
- '-570,0' : 'Pacific/Marquesas',
- '-540,0' : 'Pacific/Gambier',
- '-540,1' : 'America/Anchorage',
- '-480,1' : 'America/Los_Angeles',
- '-480,0' : 'Pacific/Pitcairn',
- '-420,0' : 'America/Phoenix',
- '-420,1' : 'America/Denver',
- '-360,0' : 'America/Guatemala',
- '-360,1' : 'America/Chicago',
- '-360,1,s' : 'Pacific/Easter',
- '-300,0' : 'America/Bogota',
- '-300,1' : 'America/New_York',
- '-270,0' : 'America/Caracas',
- '-240,1' : 'America/Halifax',
- '-240,0' : 'America/Santo_Domingo',
- '-240,1,s' : 'America/Santiago',
- '-210,1' : 'America/St_Johns',
- '-180,1' : 'America/Godthab',
- '-180,0' : 'America/Argentina/Buenos_Aires',
- '-180,1,s' : 'America/Montevideo',
- '-120,0' : 'America/Noronha',
- '-120,1' : 'America/Noronha',
- '-60,1' : 'Atlantic/Azores',
- '-60,0' : 'Atlantic/Cape_Verde',
- '0,0' : 'Etc/UTC',
- '0,1' : 'Europe/London',
- '60,1' : 'Europe/Berlin',
- '60,0' : 'Africa/Lagos',
- '60,1,s' : 'Africa/Windhoek',
- '120,1' : 'Asia/Beirut',
- '120,0' : 'Africa/Johannesburg',
- '180,0' : 'Asia/Baghdad',
- '180,1' : 'Europe/Moscow',
- '210,1' : 'Asia/Tehran',
- '240,0' : 'Asia/Dubai',
- '240,1' : 'Asia/Baku',
- '270,0' : 'Asia/Kabul',
- '300,1' : 'Asia/Yekaterinburg',
- '300,0' : 'Asia/Karachi',
- '330,0' : 'Asia/Kolkata',
- '345,0' : 'Asia/Kathmandu',
- '360,0' : 'Asia/Dhaka',
- '360,1' : 'Asia/Omsk',
- '390,0' : 'Asia/Rangoon',
- '420,1' : 'Asia/Krasnoyarsk',
- '420,0' : 'Asia/Jakarta',
- '480,0' : 'Asia/Shanghai',
- '480,1' : 'Asia/Irkutsk',
- '525,0' : 'Australia/Eucla',
- '525,1,s' : 'Australia/Eucla',
- '540,1' : 'Asia/Yakutsk',
- '540,0' : 'Asia/Tokyo',
- '570,0' : 'Australia/Darwin',
- '570,1,s' : 'Australia/Adelaide',
- '600,0' : 'Australia/Brisbane',
- '600,1' : 'Asia/Vladivostok',
- '600,1,s' : 'Australia/Sydney',
- '630,1,s' : 'Australia/Lord_Howe',
- '660,1' : 'Asia/Kamchatka',
- '660,0' : 'Pacific/Noumea',
- '690,0' : 'Pacific/Norfolk',
- '720,1,s' : 'Pacific/Auckland',
- '720,0' : 'Pacific/Tarawa',
- '765,1,s' : 'Pacific/Chatham',
- '780,0' : 'Pacific/Tongatapu',
- '780,1,s' : 'Pacific/Apia',
- '840,0' : 'Pacific/Kiritimati'
- };
-
- if (typeof exports !== 'undefined') {
- exports.jstz = jstz;
- } else {
- root.jstz = jstz;
- }
-})(this);
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