Hello,
PHP scripting language have an built in function to change between the timezones , you will need the PEAR package . In the following example show you how to convert from GMT system format to IST Format .

<?php
// include class
include ("Date.php");

// initialize object
$d = new Date("2008-10-03 16:23:48");

// set server time zone
$d->setTZByID("GMT");

// print server time
echo "Local time is " . $d->format("%A, %d %B %Y %T") . "\n";

// convert to IST
$d->convertTZByID("PST");

// output converted date/time
echo "Destination time is " . $d->format("%A, %d %B %Y %T");

?>
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