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punbb.timezone.js
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punbb.timezone.js
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// PunBB timezone functions
// version 0.1.2
//
// Based on jsTimezoneDetect by Jon Nylander at https://bitbucket.org/pellepim/jstimezonedetect
/*jslint browser: true, maxerr: 50, indent: 4 */
/*global PUNBB: true */
if (typeof PUNBB === 'undefined' || !PUNBB) {
var PUNBB = {};
}
// TIMEZONE DETECT
PUNBB.timezone = (function () {
'use strict';
var HEMISPHERE_SOUTH = 'SOUTH',
HEMISPHERE_NORTH = 'NORTH',
HEMISPHERE_UNKNOWN = 'N/A',
olson = {},
TimeZone;
/**
* A simple object containing information of utc_offset, which olson timezone key to use,
* and if the timezone cares about daylight savings or not.
*
* @constructor
* @param {string} offset - for example '-11:00'
* @param {string} olson_tz - the olson Identifier, such as "America/Denver"
* @param {boolean} uses_dst - flag for whether the time zone somehow cares about daylight savings.
*/
TimeZone = function (offset, olson_tz, uses_dst) {
this.utc_offset = offset;
this.olson_tz = olson_tz;
this.uses_dst = uses_dst;
};
/**
* 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 values of the dictionary are TimeZone objects.
*/
olson.timezones = {
'-720,0': new TimeZone('-12:00', 'Etc/GMT+12', false),
'-660,0': new TimeZone('-11:00', 'Pacific/Pago_Pago', false),
'-600,1': new TimeZone('-11:00', 'America/Adak', true),
'-600,0': new TimeZone('-10:00', 'Pacific/Honolulu', false),
'-570,0': new TimeZone('-09:30', 'Pacific/Marquesas', false),
'-540,0': new TimeZone('-09:00', 'Pacific/Gambier', false),
'-540,1': new TimeZone('-09:00', 'America/Anchorage', true),
'-480,1': new TimeZone('-08:00', 'America/Los_Angeles', true),
'-480,0': new TimeZone('-08:00', 'Pacific/Pitcairn', false),
'-420,0': new TimeZone('-07:00', 'America/Phoenix', false),
'-420,1': new TimeZone('-07:00', 'America/Denver', true),
'-360,0': new TimeZone('-06:00', 'America/Guatemala', false),
'-360,1': new TimeZone('-06:00', 'America/Chicago', true),
'-360,1,s': new TimeZone('-06:00', 'Pacific/Easter', true),
'-300,0': new TimeZone('-05:00', 'America/Bogota', false),
'-300,1': new TimeZone('-05:00', 'America/New_York', true),
'-270,0': new TimeZone('-04:30', 'America/Caracas', false),
'-240,1': new TimeZone('-04:00', 'America/Halifax', true),
'-240,0': new TimeZone('-04:00', 'America/Santo_Domingo', false),
'-240,1,s': new TimeZone('-04:00', 'America/Asuncion', true),
'-210,1': new TimeZone('-03:30', 'America/St_Johns', true),
'-180,1': new TimeZone('-03:00', 'America/Godthab', true),
'-180,0': new TimeZone('-03:00', 'America/Argentina/Buenos_Aires', false),
'-180,1,s': new TimeZone('-03:00', 'America/Montevideo', true),
'-120,0': new TimeZone('-02:00', 'America/Noronha', false),
'-120,1': new TimeZone('-02:00', 'Etc/GMT+2', true),
'-60,1': new TimeZone('-01:00', 'Atlantic/Azores', true),
'-60,0': new TimeZone('-01:00', 'Atlantic/Cape_Verde', false),
'0,0': new TimeZone('00:00', 'Etc/UTC', false),
'0,1': new TimeZone('00:00', 'Europe/London', true),
'60,1': new TimeZone('+01:00', 'Europe/Berlin', true),
'60,0': new TimeZone('+01:00', 'Africa/Lagos', false),
'60,1,s': new TimeZone('+01:00', 'Africa/Windhoek', true),
'120,1': new TimeZone('+02:00', 'Asia/Beirut', true),
'120,0': new TimeZone('+02:00', 'Africa/Johannesburg', false),
'180,1': new TimeZone('+03:00', 'Europe/Moscow', true),
'180,0': new TimeZone('+03:00', 'Asia/Baghdad', false),
'210,1': new TimeZone('+03:30', 'Asia/Tehran', true),
'240,0': new TimeZone('+04:00', 'Asia/Dubai', false),
'240,1': new TimeZone('+04:00', 'Asia/Yerevan', true),
'270,0': new TimeZone('+04:30', 'Asia/Kabul', false),
'300,1': new TimeZone('+05:00', 'Asia/Yekaterinburg', true),
'300,0': new TimeZone('+05:00', 'Asia/Karachi', false),
'330,0': new TimeZone('+05:30', 'Asia/Kolkata', false),
'345,0': new TimeZone('+05:45', 'Asia/Kathmandu', false),
'360,0': new TimeZone('+06:00', 'Asia/Dhaka', false),
'360,1': new TimeZone('+06:00', 'Asia/Omsk', true),
'390,0': new TimeZone('+06:30', 'Asia/Rangoon', false),
'420,1': new TimeZone('+07:00', 'Asia/Krasnoyarsk', true),
'420,0': new TimeZone('+07:00', 'Asia/Jakarta', false),
'480,0': new TimeZone('+08:00', 'Asia/Shanghai', false),
'480,1': new TimeZone('+08:00', 'Asia/Irkutsk', true),
'525,0': new TimeZone('+08:45', 'Australia/Eucla', true),
'525,1,s': new TimeZone('+08:45', 'Australia/Eucla', true),
'540,1': new TimeZone('+09:00', 'Asia/Yakutsk', true),
'540,0': new TimeZone('+09:00', 'Asia/Tokyo', false),
'570,0': new TimeZone('+09:30', 'Australia/Darwin', false),
'570,1,s': new TimeZone('+09:30', 'Australia/Adelaide', true),
'600,0': new TimeZone('+10:00', 'Australia/Brisbane', false),
'600,1': new TimeZone('+10:00', 'Asia/Vladivostok', true),
'600,1,s': new TimeZone('+10:00', 'Australia/Sydney', true),
'630,1,s': new TimeZone('+10:30', 'Australia/Lord_Howe', true),
'660,1': new TimeZone('+11:00', 'Asia/Kamchatka', true),
'660,0': new TimeZone('+11:00', 'Pacific/Noumea', false),
'690,0': new TimeZone('+11:30', 'Pacific/Norfolk', false),
'720,1,s': new TimeZone('+12:00', 'Pacific/Auckland', true),
'720,0': new TimeZone('+12:00', 'Pacific/Tarawa', false),
'765,1,s': new TimeZone('+12:45', 'Pacific/Chatham', true),
'780,0': new TimeZone('+13:00', 'Pacific/Tongatapu', false),
'780,1,s': new TimeZone('+13:00', 'Pacific/Apia', true),
'840,0': new TimeZone('+14:00', 'Pacific/Kiritimati', false)
};
/**
* Gets the offset in minutes from UTC for a certain date.
*
* @param date
* @returns {number}
*/
function get_date_offset(date) {
return -date.getTimezoneOffset();
}
function get_january_offset() {
var now = new Date();
return get_date_offset(new Date(now.getFullYear(), 0, 1, 0, 0, 0, 0));
}
function get_june_offset() {
var now = new Date();
return get_date_offset(new Date(now.getFullYear(), 5, 1, 0, 0, 0, 0));
}
/**
* This function does some basic calculations to create information about
* the user's timezone.
*
* Returns a primitive object on the format
* {'utc_offset' : -9, 'dst': 1, hemisphere' : 'north'}
* where dst is 1 if the region uses daylight savings.
*
* @returns {Object}
*/
function get_info() {
var january_offset = get_january_offset(),
june_offset = get_june_offset(),
diff = january_offset - june_offset;
if (diff < 0) {
return {
'utc_offset': january_offset,
'dst': 1,
'hemisphere': HEMISPHERE_NORTH
};
} else if (diff > 0) {
return {
'utc_offset': june_offset,
'dst': 1,
'hemisphere': HEMISPHERE_SOUTH
};
}
return {
'utc_offset': january_offset,
'dst': 0,
'hemisphere': HEMISPHERE_UNKNOWN
};
}
return {
/**
* 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 timezone_key_info = get_info(),
hemisphere_suffix = '',
tz_key;
if (timezone_key_info.hemisphere === HEMISPHERE_SOUTH) {
hemisphere_suffix = ',s';
}
tz_key = timezone_key_info.utc_offset + ',' + timezone_key_info.dst.toString() + hemisphere_suffix;
return {
'timezone': olson.timezones[tz_key],
'key': tz_key
};
},
//
detect_on_register_form: function () {
PUNBB.common.addDOMReadyEvent(function () {
var timezone = PUNBB.timezone.determine().timezone,
timezone_el = document.getElementById('register_timezone'),
dst_el = document.getElementById('register_dst');
if (timezone_el && dst_el) {
timezone_el.value = timezone.utc_offset;
dst_el.value = timezone.uses_dst ? '1' : '0';
}
});
}
};
}());