Answers for "global php setting to store date and time with indian timezone"

date_default_timezone_set for india in php

<?php
	date_default_timezone_set("Asia/Kolkata");   //India time (GMT+5:30)
	echo date('d-m-Y H:i:s');
?>

how to get the list of available timezones in php

//To Get the list of timezones available in php
//use the static function listIdentifiers() on DateTimeZone class
$list = DateTimeZone::listIdentifiers();
print_r($list)