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Working with php timezone

The DateTime class provides all the date and time handling functionality, while the DateTimeZone provides DateTime objects with all the time zone information. We just need to provide DateTimeZone with the time zone in the Area/Location format (for example, the time zone in which this server is located is America/Los_Angeles), and it will return an object representing that time zone. We can pass this to a DateTime object to convert any time into this time zone.
Here is an overview of the steps required to accomplish this:

  1. Collect the time zone from the user and store in Area/Location format
  2. Create a DateTimeZone object using the provided time zone
  3. Create a DateTime object, providing it the time in the local time zone
  4. Convert the DateTime object to the time zone created in step 1
  5. Output the time from the DateTime object

function timezonearray() {
    $zonelist = array('Kwajalein' => '(GMT-12:00) International Date Line West',
        'Pacific/Midway' => '(GMT-11:00) Midway Island',
        'Pacific/Samoa' => '(GMT-11:00) Samoa',
        'Pacific/Honolulu' => '(GMT-10:00) Hawaii',
        'America/Anchorage' => '(GMT-09:00) Alaska',
        'America/Los_Angeles' => '(GMT-08:00) Pacific Time (US & Canada)',
        'America/Tijuana' => '(GMT-08:00) Tijuana, Baja California',
        'America/Denver' => '(GMT-07:00) Mountain Time (US & Canada)',
        'America/Chihuahua' => '(GMT-07:00) Chihuahua',
        'America/Mazatlan' => '(GMT-07:00) Mazatlan',
        'America/Phoenix' => '(GMT-07:00) Arizona',
        'America/Regina' => '(GMT-06:00) Saskatchewan',
        'America/Tegucigalpa' => '(GMT-06:00) Central America',
        'America/Chicago' => '(GMT-06:00) Central Time (US & Canada)',
        'America/Mexico_City' => '(GMT-06:00) Mexico City',
        'America/Monterrey' => '(GMT-06:00) Monterrey',
        'America/New_York' => '(GMT-05:00) Eastern Time (US & Canada)',
        'America/Bogota' => '(GMT-05:00) Bogota',
        'America/Lima' => '(GMT-05:00) Lima',
        'America/Rio_Branco' => '(GMT-05:00) Rio Branco',
        'America/Indiana/Indianapolis' => '(GMT-05:00) Indiana (East)',
        'America/Caracas' => '(GMT-04:30) Caracas',
        'America/Halifax' => '(GMT-04:00) Atlantic Time (Canada)',
        'America/Manaus' => '(GMT-04:00) Manaus',
        'America/Santiago' => '(GMT-04:00) Santiago',
        'America/La_Paz' => '(GMT-04:00) La Paz',
        'America/St_Johns' => '(GMT-03:30) Newfoundland',
        'America/Argentina/Buenos_Aires' => '(GMT-03:00) Georgetown',
        'America/Sao_Paulo' => '(GMT-03:00) Brasilia',
        'America/Godthab' => '(GMT-03:00) Greenland',
        'America/Montevideo' => '(GMT-03:00) Montevideo',
        'Atlantic/South_Georgia' => '(GMT-02:00) Mid-Atlantic',
        'Atlantic/Azores' => '(GMT-01:00) Azores',
        'Atlantic/Cape_Verde' => '(GMT-01:00) Cape Verde Is.',
        'Europe/Dublin' => '(GMT) Dublin',
        'Europe/Lisbon' => '(GMT) Lisbon',
        'Europe/London' => '(GMT) London',
        'Africa/Monrovia' => '(GMT) Monrovia',
        'Atlantic/Reykjavik' => '(GMT) Reykjavik',
        'Africa/Casablanca' => '(GMT) Casablanca',
        'Europe/Belgrade' => '(GMT+01:00) Belgrade',
        'Europe/Bratislava' => '(GMT+01:00) Bratislava',
        'Europe/Budapest' => '(GMT+01:00) Budapest',
        'Europe/Ljubljana' => '(GMT+01:00) Ljubljana',
        'Europe/Prague' => '(GMT+01:00) Prague',
        'Europe/Sarajevo' => '(GMT+01:00) Sarajevo',
        'Europe/Skopje' => '(GMT+01:00) Skopje',
        'Europe/Warsaw' => '(GMT+01:00) Warsaw',
        'Europe/Zagreb' => '(GMT+01:00) Zagreb',
        'Europe/Brussels' => '(GMT+01:00) Brussels',
        'Europe/Copenhagen' => '(GMT+01:00) Copenhagen',
        'Europe/Madrid' => '(GMT+01:00) Madrid',
        'Europe/Paris' => '(GMT+01:00) Paris',
        'Africa/Algiers' => '(GMT+01:00) West Central Africa',
        'Europe/Amsterdam' => '(GMT+01:00) Amsterdam',
        'Europe/Berlin' => '(GMT+01:00) Berlin',
        'Europe/Rome' => '(GMT+01:00) Rome',
        'Europe/Stockholm' => '(GMT+01:00) Stockholm',
        'Europe/Vienna' => '(GMT+01:00) Vienna',
        'Europe/Minsk' => '(GMT+02:00) Minsk',
        'Africa/Cairo' => '(GMT+02:00) Cairo',
        'Europe/Helsinki' => '(GMT+02:00) Helsinki',
        'Europe/Riga' => '(GMT+02:00) Riga',
        'Europe/Sofia' => '(GMT+02:00) Sofia',
        'Europe/Tallinn' => '(GMT+02:00) Tallinn',
        'Europe/Vilnius' => '(GMT+02:00) Vilnius',
        'Europe/Athens' => '(GMT+02:00) Athens',
        'Europe/Bucharest' => '(GMT+02:00) Bucharest',
        'Europe/Istanbul' => '(GMT+02:00) Istanbul',
        'Asia/Jerusalem' => '(GMT+02:00) Jerusalem',
        'Asia/Amman' => '(GMT+02:00) Amman',
        'Asia/Beirut' => '(GMT+02:00) Beirut',
        'Africa/Windhoek' => '(GMT+02:00) Windhoek',
        'Africa/Harare' => '(GMT+02:00) Harare',
        'Asia/Kuwait' => '(GMT+03:00) Kuwait',
        'Asia/Riyadh' => '(GMT+03:00) Riyadh',
        'Asia/Baghdad' => '(GMT+03:00) Baghdad',
        'Africa/Nairobi' => '(GMT+03:00) Nairobi',
        'Asia/Tbilisi' => '(GMT+03:00) Tbilisi',
        'Europe/Moscow' => '(GMT+03:00) Moscow',
        'Europe/Volgograd' => '(GMT+03:00) Volgograd',
        'Asia/Tehran' => '(GMT+03:30) Tehran',
        'Asia/Muscat' => '(GMT+04:00) Muscat',
        'Asia/Baku' => '(GMT+04:00) Baku',
        'Asia/Yerevan' => '(GMT+04:00) Yerevan',
        'Asia/Yekaterinburg' => '(GMT+05:00) Ekaterinburg',
        'Asia/Karachi' => '(GMT+05:00) Karachi',
        'Asia/Tashkent' => '(GMT+05:00) Tashkent',
        'Asia/Kolkata' => '(GMT+05:30) Calcutta',
        'Asia/Colombo' => '(GMT+05:30) Sri Jayawardenepura',
        'Asia/Katmandu' => '(GMT+05:45) Kathmandu',
        'Asia/Dhaka' => '(GMT+06:00) Dhaka',
        'Asia/Almaty' => '(GMT+06:00) Almaty',
        'Asia/Novosibirsk' => '(GMT+06:00) Novosibirsk',
        'Asia/Rangoon' => '(GMT+06:30) Yangon (Rangoon)',
        'Asia/Krasnoyarsk' => '(GMT+07:00) Krasnoyarsk',
        'Asia/Bangkok' => '(GMT+07:00) Bangkok',
        'Asia/Jakarta' => '(GMT+07:00) Jakarta',
        'Asia/Brunei' => '(GMT+08:00) Beijing',
        'Asia/Chongqing' => '(GMT+08:00) Chongqing',
        'Asia/Hong_Kong' => '(GMT+08:00) Hong Kong',
        'Asia/Urumqi' => '(GMT+08:00) Urumqi',
        'Asia/Irkutsk' => '(GMT+08:00) Irkutsk',
        'Asia/Ulaanbaatar' => '(GMT+08:00) Ulaan Bataar',
        'Asia/Kuala_Lumpur' => '(GMT+08:00) Kuala Lumpur',
        'Asia/Singapore' => '(GMT+08:00) Singapore',
        'Asia/Taipei' => '(GMT+08:00) Taipei',
        'Australia/Perth' => '(GMT+08:00) Perth',
        'Asia/Seoul' => '(GMT+09:00) Seoul',
        'Asia/Tokyo' => '(GMT+09:00) Tokyo',
        'Asia/Yakutsk' => '(GMT+09:00) Yakutsk',
        'Australia/Darwin' => '(GMT+09:30) Darwin',
        'Australia/Adelaide' => '(GMT+09:30) Adelaide',
        'Australia/Canberra' => '(GMT+10:00) Canberra',
        'Australia/Melbourne' => '(GMT+10:00) Melbourne',
        'Australia/Sydney' => '(GMT+10:00) Sydney',
        'Australia/Brisbane' => '(GMT+10:00) Brisbane',
        'Australia/Hobart' => '(GMT+10:00) Hobart',
        'Asia/Vladivostok' => '(GMT+10:00) Vladivostok',
        'Pacific/Guam' => '(GMT+10:00) Guam',
        'Pacific/Port_Moresby' => '(GMT+10:00) Port Moresby',
        'Asia/Magadan' => '(GMT+11:00) Magadan',
        'Pacific/Fiji' => '(GMT+12:00) Fiji',
        'Asia/Kamchatka' => '(GMT+12:00) Kamchatka',
        'Pacific/Auckland' => '(GMT+12:00) Auckland',
        'Pacific/Tongatapu' => '(GMT+13:00) Nukualofa'

    return $zonelist;

function getSiteTime($timestamp="") {

     $dtzone = new DateTimeZone($selectedTimezone);

    $time = date('r', $timestamp);

    $dtime = new DateTime($time);


    $time = $dtime->format('m-d-Y, a\t g.i A');

    return $time;


The Time :
Thats it

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