JSON of timezone offsets and their timezone strings.

timezone.js

var zones = {
	"-12:00" : "Etc/GMT-12",
	"-11:00" : "Etc/GMT-11",
	"-11:00" : "Pacific/Midway",
	"-10:00" : "America/Adak",
	"-09:00" : "America/Anchorage",
	"-09:00" : "Pacific/Gambier",
	"-08:00" : "America/Dawson_Creek",
	"-08:00" : "America/Ensenada",
	"-08:00" : "America/Los_Angeles",
	"-07:00" : "America/Chihuahua",
	"-07:00" : "America/Denver",
	"-06:00" : "America/Belize",
	"-06:00" : "America/Cancun",
	"-06:00" : "America/Chicago",
	"-06:00" : "Chile/EasterIsland",
	"-05:00" : "America/Bogota",
	"-05:00" : "America/Havana",
	"-05:00" : "America/New_York",
	"-04:30" : "America/Caracas",
	"-04:00" : "America/Campo_Grande",
	"-04:00" : "America/Glace_Bay",
	"-04:00" : "America/Goose_Bay",
	"-04:00" : "America/Santiago",
	"-04:00" : "America/La_Paz",
	"-03:00" : "America/Argentina/Buenos_Aires",
	"-03:00" : "America/Montevideo",
	"-03:00" : "America/Araguaina",
	"-03:00" : "America/Godthab",
	"-03:00" : "America/Miquelon",
	"-03:00" : "America/Sao_Paulo",
	"-03:30" : "America/St_Johns",
	"-02:00" : "America/Noronha",
	"-01:00" : "Atlantic/Cape_Verde",
	"+00:00" : "Europe/Belfast",
	"+00:00" : "Africa/Abidjan",
	"+00:00" : "Europe/Dublin",
	"+00:00" : "Europe/Lisbon",
	"+00:00" : "Europe/London",
	"+00:00" : "UTC",
	"+01:00" : "Africa/Algiers",
	"+01:00" : "Africa/Windhoek",
	"+01:00" : "Atlantic/Azores",
	"+01:00" : "Atlantic/Stanley",
	"+01:00" : "Europe/Amsterdam",
	"+01:00" : "Europe/Belgrade",
	"+01:00" : "Europe/Brussels",
	"+02:00" : "Africa/Cairo",
	"+02:00" : "Africa/Blantyre",
	"+02:00" : "Asia/Beirut",
	"+02:00" : "Asia/Damascus",
	"+02:00" : "Asia/Gaza",
	"+02:00" : "Asia/Jerusalem",
	"+03:00" : "Africa/Addis_Ababa",
	"+03:00" : "Asia/Riyadh89",
	"+03:00" : "Europe/Minsk",
	"+03:30" : "Asia/Tehran",
	"+04:00" : "Asia/Dubai",
	"+04:00" : "Asia/Yerevan",
	"+04:00" : "Europe/Moscow",
	"+04:30" : "Asia/Kabul",
	"+05:00" : "Asia/Tashkent",
	"+05:30" : "Asia/Kolkata",
	"+05:45" : "Asia/Katmandu",
	"+06:00" : "Asia/Dhaka",
	"+06:00" : "Asia/Yekaterinburg",
	"+06:30" : "Asia/Rangoon",
	"+07:00" : "Asia/Bangkok",
	"+07:00" : "Asia/Novosibirsk",
	"+08:00" : "Etc/GMT+8",
	"+08:00" : "Asia/Hong_Kong",
	"+08:00" : "Asia/Krasnoyarsk",
	"+08:00" : "Australia/Perth",
	"+08:45" : "Australia/Eucla",
	"+09:00" : "Asia/Irkutsk",
	"+09:00" : "Asia/Seoul",
	"+09:00" : "Asia/Tokyo",
	"+09:30" : "Australia/Adelaide",
	"+09:30" : "Australia/Darwin",
	"+09:30" : "Pacific/Marquesas",
	"+10:00" : "Etc/GMT+10",
	"+10:00" : "Australia/Brisbane",
	"+10:00" : "Australia/Hobart",
	"+10:00" : "Asia/Yakutsk",
	"+10:30" : "Australia/Lord_Howe",
	"+11:00" : "Asia/Vladivostok",
	"+11:30" : "Pacific/Norfolk",
	"+12:00" : "Etc/GMT+12",
	"+12:00" : "Asia/Anadyr",
	"+12:00" : "Asia/Magadan",
	"+12:00" : "Pacific/Auckland",
	"+12:45" : "Pacific/Chatham",
	"+13:00" : "Pacific/Tongatapu",
	"+14:00" : "Pacific/Kiritimati"
}