<?php 
 		 
$zones = timezone_identifiers_list(); 
$Time = new DateTime('now', new DateTimeZone('UTC')); 
$timezone = array(); 
 
         
foreach ($zones as $zone)  
{
$timezone['timezones'][$zone] = $Time->setTimezone(new DateTimeZone($zone))->format('O'); 
}

$localtime = localtime(time(), true); 
$timezone['isDaylightSaving'] =  !!$localtime['tm_isdst']; 
 
echo json_encode($timezone); 
 
?>