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jstz.js
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jstz.js
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(function (root) {/*global exports, Intl*/
/**
* This script gives you the zone info key representing your device's time zone setting.
*
* @name jsTimezoneDetect
* @version 1.0.6
* @author Jon Nylander
* @license MIT License - https://bitbucket.org/pellepim/jstimezonedetect/src/default/LICENCE.txt
*
* For usage and examples, visit:
* http://pellepim.bitbucket.org/jstz/
*
* Copyright (c) Jon Nylander
*/
/**
* Namespace to hold all the code for timezone detection.
*/
var jstz = (function () {
'use strict';
var HEMISPHERE_SOUTH = 's',
consts = {
DAY: 86400000,
HOUR: 3600000,
MINUTE: 60000,
SECOND: 1000,
BASELINE_YEAR: 2014,
MAX_SCORE: 864000000, // 10 days
AMBIGUITIES: {
'America/Denver': ['America/Mazatlan'],
'America/Chicago': ['America/Mexico_City'],
'America/Asuncion': ['America/Campo_Grande', 'America/Santiago'],
'America/Montevideo': ['America/Sao_Paulo', 'America/Santiago'],
'Asia/Beirut': ['Asia/Amman', 'Asia/Jerusalem', 'Europe/Helsinki', 'Asia/Damascus', 'Africa/Cairo', 'Asia/Gaza', 'Europe/Minsk', 'Africa/Windhoek'],
'Pacific/Auckland': ['Pacific/Fiji'],
'America/Los_Angeles': ['America/Santa_Isabel'],
'America/New_York': ['America/Havana'],
'America/Halifax': ['America/Goose_Bay'],
'America/Godthab': ['America/Miquelon'],
'Asia/Dubai': ['Asia/Yerevan'],
'Asia/Jakarta': ['Asia/Krasnoyarsk'],
'Asia/Shanghai': ['Asia/Irkutsk', 'Australia/Perth'],
'Australia/Sydney': ['Australia/Lord_Howe'],
'Asia/Tokyo': ['Asia/Yakutsk'],
'Asia/Dhaka': ['Asia/Omsk'],
'Asia/Baku': ['Asia/Yerevan'],
'Australia/Brisbane': ['Asia/Vladivostok'],
'Pacific/Noumea': ['Asia/Vladivostok'],
'Pacific/Majuro': ['Asia/Kamchatka', 'Pacific/Fiji'],
'Pacific/Tongatapu': ['Pacific/Apia'],
'Asia/Baghdad': ['Europe/Minsk', 'Europe/Moscow'],
'Asia/Karachi': ['Asia/Yekaterinburg'],
'Africa/Johannesburg': ['Asia/Gaza', 'Africa/Cairo']
}
},
/**
* Gets the offset in minutes from UTC for a certain date.
* @param {Date} date
* @returns {Number}
*/
get_date_offset = function get_date_offset(date) {
var offset = -date.getTimezoneOffset();
return (offset !== null ? offset : 0);
},
get_offsets = function get_offsets() {
var offsets = [];
for (var month = 0; month <= 11; month++) {
for (var date = 1; date <= 28; date++) {
var currentOffset = get_date_offset(new Date(consts.BASELINE_YEAR, month, date));
if (!offsets) {
offsets.push();
} else if (offsets && offsets[offsets.length-1] !== currentOffset) {
offsets.push(currentOffset);
}
}
}
return offsets;
},
/**
* 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 lookup_key() {
var diff = 0;
var offsets = get_offsets();
if (offsets.length > 1) {
diff = offsets[0] - offsets[1];
}
if (offsets.length > 3) {
return offsets[0] + ",1,weird";
} else if (diff < 0) {
return offsets[0] + ",1";
} else if (diff > 0) {
return offsets[1] + ",1," + HEMISPHERE_SOUTH;
}
return offsets[0] + ",0";
},
/**
* Tries to get the time zone key directly from the operating system for those
* environments that support the ECMAScript Internationalization API.
*/
get_from_internationalization_api = function get_from_internationalization_api() {
var format, timezone;
if (!Intl || typeof Intl === "undefined" || typeof Intl.DateTimeFormat === "undefined") {
return;
}
format = Intl.DateTimeFormat();
if (typeof format === "undefined" || typeof format.resolvedOptions === "undefined") {
return;
}
timezone = format.resolvedOptions().timeZone;
if (timezone && (timezone.indexOf("/") > -1 || timezone === 'UTC')) {
return timezone;
}
},
/**
* Starting point for getting all the DST rules for a specific year
* for the current timezone (as described by the client system).
*
* Returns an object with start and end attributes, or false if no
* DST rules were found for the year.
*
* @param year
* @returns {Object} || {Boolean}
*/
dst_dates = function dst_dates(year) {
var yearstart = new Date(year, 0, 1, 0, 0, 1, 0).getTime();
var yearend = new Date(year, 12, 31, 23, 59, 59).getTime();
var current = yearstart;
var offset = (new Date(current)).getTimezoneOffset();
var dst_start = null;
var dst_end = null;
while (current < yearend - 86400000) {
var dateToCheck = new Date(current);
var dateToCheckOffset = dateToCheck.getTimezoneOffset();
if (dateToCheckOffset !== offset) {
if (dateToCheckOffset < offset) {
dst_start = dateToCheck;
}
if (dateToCheckOffset > offset) {
dst_end = dateToCheck;
}
offset = dateToCheckOffset;
}
current += 86400000;
}
if (dst_start && dst_end) {
return {
s: find_dst_fold(dst_start).getTime(),
e: find_dst_fold(dst_end).getTime()
};
}
return false;
},
/**
* Probably completely unnecessary function that recursively finds the
* exact (to the second) time when a DST rule was changed.
*
* @param a_date - The candidate Date.
* @param padding - integer specifying the padding to allow around the candidate
* date for finding the fold.
* @param iterator - integer specifying how many milliseconds to iterate while
* searching for the fold.
*
* @returns {Date}
*/
find_dst_fold = function find_dst_fold(a_date, padding, iterator) {
if (typeof padding === 'undefined') {
padding = consts.DAY;
iterator = consts.HOUR;
}
var date_start = new Date(a_date.getTime() - padding).getTime();
var date_end = a_date.getTime() + padding;
var offset = new Date(date_start).getTimezoneOffset();
var current = date_start;
var dst_change = null;
while (current < date_end - iterator) {
var dateToCheck = new Date(current);
var dateToCheckOffset = dateToCheck.getTimezoneOffset();
if (dateToCheckOffset !== offset) {
dst_change = dateToCheck;
break;
}
current += iterator;
}
if (padding === consts.DAY) {
return find_dst_fold(dst_change, consts.HOUR, consts.MINUTE);
}
if (padding === consts.HOUR) {
return find_dst_fold(dst_change, consts.MINUTE, consts.SECOND);
}
return dst_change;
},
windows7_adaptations = function windows7_adaptions(rule_list, preliminary_timezone, score, sample) {
if (score !== 'N/A') {
return score;
}
if (preliminary_timezone === 'Asia/Beirut') {
if (sample.name === 'Africa/Cairo') {
if (rule_list[6].s === 1398376800000 && rule_list[6].e === 1411678800000) {
return 0;
}
}
if (sample.name === 'Asia/Jerusalem') {
if (rule_list[6].s === 1395964800000 && rule_list[6].e === 1411858800000) {
return 0;
}
}
} else if (preliminary_timezone === 'America/Santiago') {
if (sample.name === 'America/Asuncion') {
if (rule_list[6].s === 1412481600000 && rule_list[6].e === 1397358000000) {
return 0;
}
}
if (sample.name === 'America/Campo_Grande') {
if (rule_list[6].s === 1413691200000 && rule_list[6].e === 1392519600000) {
return 0;
}
}
} else if (preliminary_timezone === 'America/Montevideo') {
if (sample.name === 'America/Sao_Paulo') {
if (rule_list[6].s === 1413687600000 && rule_list[6].e === 1392516000000) {
return 0;
}
}
} else if (preliminary_timezone === 'Pacific/Auckland') {
if (sample.name === 'Pacific/Fiji') {
if (rule_list[6].s === 1414245600000 && rule_list[6].e === 1396101600000) {
return 0;
}
}
}
return score;
},
/**
* Takes the DST rules for the current timezone, and proceeds to find matches
* in the jstz.olson.dst_rules.zones array.
*
* Compares samples to the current timezone on a scoring basis.
*
* Candidates are ruled immediately if either the candidate or the current zone
* has a DST rule where the other does not.
*
* Candidates are ruled out immediately if the current zone has a rule that is
* outside the DST scope of the candidate.
*
* Candidates are included for scoring if the current zones rules fall within the
* span of the samples rules.
*
* Low score is best, the score is calculated by summing up the differences in DST
* rules and if the consts.MAX_SCORE is overreached the candidate is ruled out.
*
* Yah follow? :)
*
* @param rule_list
* @param preliminary_timezone
* @returns {*}
*/
best_dst_match = function best_dst_match(rule_list, preliminary_timezone) {
var score_sample = function score_sample(sample) {
var score = 0;
for (var j = 0; j < rule_list.length; j++) {
// Both sample and current time zone report DST during the year.
if (!!sample.rules[j] && !!rule_list[j]) {
// The current time zone's DST rules are inside the sample's. Include.
if (rule_list[j].s >= sample.rules[j].s && rule_list[j].e <= sample.rules[j].e) {
score = 0;
score += Math.abs(rule_list[j].s - sample.rules[j].s);
score += Math.abs(sample.rules[j].e - rule_list[j].e);
// The current time zone's DST rules are outside the sample's. Discard.
} else {
score = 'N/A';
break;
}
// The max score has been reached. Discard.
if (score > consts.MAX_SCORE) {
score = 'N/A';
break;
}
}
}
score = windows7_adaptations(rule_list, preliminary_timezone, score, sample);
return score;
};
var scoreboard = {};
var dst_zones = jstz.olson.dst_rules.zones;
var dst_zones_length = dst_zones.length;
var ambiguities = consts.AMBIGUITIES[preliminary_timezone];
for (var i = 0; i < dst_zones_length; i++) {
var sample = dst_zones[i];
var score = score_sample(dst_zones[i]);
if (score !== 'N/A') {
scoreboard[sample.name] = score;
}
}
for (var tz in scoreboard) {
if (scoreboard.hasOwnProperty(tz)) {
for (var j = 0; j < ambiguities.length; j++) {
if (ambiguities[j] === tz) {
return tz;
}
}
}
}
return preliminary_timezone;
},
/**
* Takes the preliminary_timezone as detected by lookup_key().
*
* Builds up the current timezones DST rules for the years defined
* in the jstz.olson.dst_rules.years array.
*
* If there are no DST occurences for those years, immediately returns
* the preliminary timezone. Otherwise proceeds and tries to solve
* ambiguities.
*
* @param preliminary_timezone
* @returns {String} timezone_name
*/
get_by_dst = function get_by_dst(preliminary_timezone) {
var get_rules = function get_rules() {
var rule_list = [];
for (var i = 0; i < jstz.olson.dst_rules.years.length; i++) {
var year_rules = dst_dates(jstz.olson.dst_rules.years[i]);
rule_list.push(year_rules);
}
return rule_list;
};
var check_has_dst = function check_has_dst(rules) {
for (var i = 0; i < rules.length; i++) {
if (rules[i] !== false) {
return true;
}
}
return false;
};
var rules = get_rules();
var has_dst = check_has_dst(rules);
if (has_dst) {
return best_dst_match(rules, preliminary_timezone);
}
return preliminary_timezone;
},
/**
* Uses get_timezone_info() to formulate a key to use in the olson.timezones dictionary.
*
* Returns an object with one function ".name()"
*
* @returns Object
*/
determine = function determine(using_intl) {
var preliminary_tz = false;
var needle = lookup_key();
if (using_intl || typeof using_intl === 'undefined') {
preliminary_tz = get_from_internationalization_api();
}
if (!preliminary_tz) {
preliminary_tz = jstz.olson.timezones[needle];
if (typeof consts.AMBIGUITIES[preliminary_tz] !== 'undefined') {
preliminary_tz = get_by_dst(preliminary_tz);
}
}
return {
name: function () {
return preliminary_tz;
},
using_intl: using_intl || typeof using_intl === 'undefined',
needle: needle,
offsets: get_offsets()
};
};
return {
determine: determine
};
}());
jstz.olson = 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();
*/
jstz.olson.timezones = {
'-720,0': 'Etc/GMT+12',
'-660,0': 'Pacific/Pago_Pago',
'-660,1,s': 'Pacific/Apia', // Why? Because windows... cry!
'-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/Asuncion',
'-210,1': 'America/St_Johns',
'-180,1': 'America/Godthab',
'-180,0': 'America/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': 'UTC',
'0,1': 'Europe/London',
'0,1,weird': 'Africa/Casablanca',
'60,1': 'Europe/Berlin',
'60,0': 'Africa/Lagos',
'60,1,weird': 'Africa/Casablanca',
'120,1': 'Asia/Beirut',
'120,1,weird': 'Africa/Cairo',
'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/Calcutta',
'345,0': 'Asia/Katmandu',
'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/Majuro',
'765,1,s': 'Pacific/Chatham',
'780,0': 'Pacific/Tongatapu',
'780,1,s': 'Pacific/Apia',
'840,0': 'Pacific/Kiritimati'
};
/* Build time: 2019-09-09 11:29:41Z Build by invoking python utilities/dst.py generate */
jstz.olson.dst_rules = {
"years": [
2008,
2009,
2010,
2011,
2012,
2013,
2014
],
"zones": [
{
"name": "Africa/Cairo",
"rules": [
{
"e": 1219957200000,
"s": 1209074400000
},
{
"e": 1250802000000,
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},
{
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},
false,
false,
false,
{
"e": 1411678800000,
"s": 1406844000000
}
]
},
{
"name": "America/Asuncion",
"rules": [
{
"e": 1205031600000,
"s": 1224388800000
},
{
"e": 1236481200000,
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},
{
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},
{
"e": 1302404400000,
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Campo_Grande",
"rules": [
{
"e": 1203217200000,
"s": 1224388800000
},
{
"e": 1234666800000,
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Goose_Bay",
"rules": [
{
"e": 1225594860000,
"s": 1205035260000
},
{
"e": 1257044460000,
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Havana",
"rules": [
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Mazatlan",
"rules": [
{
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},
{
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},
{
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{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Mexico_City",
"rules": [
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Miquelon",
"rules": [
{
"e": 1225598400000,
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Santa_Isabel",
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{
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{
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{
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{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Santiago",
"rules": [
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "America/Sao_Paulo",
"rules": [
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "Asia/Amman",
"rules": [
{
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},
{
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},
{
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},
{
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},
false,
false,
{
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}
]
},
{
"name": "Asia/Damascus",
"rules": [
{
"e": 1225486800000,
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
{
"name": "Asia/Dubai",
"rules": [
false,
false,
false,
false,
false,
false,
false
]
},
{
"name": "Asia/Gaza",
"rules": [
{
"e": 1219957200000,
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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}