Převod formátu data v PHP

Použijte strtotime() a date():

$originalDate = "Mon Apr 22 2013 12:16:00 GMT+0530 (India Standard Time)" ;
$newDate = date("Y-m-d H:i:s", strtotime($originalDate));

(viz strtotime a datum dokumenty na webu PHP).

nebo použijte DateTime:

<?php
$source = "Mon Apr 22 2013 12:16:00 GMT+0530 (India Standard Time)";
$date = new DateTime($source);
echo $date->format("Y-m-d H:i:s"); // 22 2013 12:16:00
echo $date->format("Y-m-d H:i:s"); // 22 2013 12:16:00
?>

DEMO