[Solved] How to identify time zone of client machine using JavaScript?

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<script>    
var offset = (new Date()).getTimezoneOffset();
var timezones = {
  '-12': 'Pacific/Kwajalein',
  '-11': 'Pacific/Samoa',
  '-10': 'Pacific/Honolulu',
  '-9': 'America/Juneau',
  '-8': 'America/Los_Angeles',
  '-7': 'America/Denver',
  '-6': 'America/Mexico_City',
  '-5': 'America/New_York',
  '-4': 'America/Caracas',
  '-3.5': 'America/St_Johns',
  '-3': 'America/Argentina/Buenos_Aires',
  '-2': 'Atlantic/Azores',
  '-1': 'Atlantic/Azores',
  '0': 'Europe/London',
  '1': 'Europe/Paris',
  '2': 'Europe/Helsinki',
  '3': 'Europe/Moscow',
  '3.5': 'Asia/Tehran',
  '4': 'Asia/Baku',
  '4.5': 'Asia/Kabul',
  '5': 'Asia/Karachi',
  '5.5': 'Asia/Calcutta',
  '6': 'Asia/Colombo',
  '7': 'Asia/Bangkok',
  '8': 'Asia/Singapore',
  '9': 'Asia/Tokyo',
  '9.5': 'Australia/Darwin',
  '10': 'Pacific/Guam',
  '11': 'Asia/Magadan',
  '12': 'Asia/Kamchatka'
};
var a = timezones[-offset / 60];
document.cookie = "cookieName=" + a;
</script>

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solved How to identify time zone of client machine using JavaScript?