- substr: documentation ( source)
- stripos: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$paymentdate = "Sat May 16 2015 07:55:49 GMT+0400 (GMT Daylight Time)";
$start = stripos($paymentdate, "gmt");
echo $start . "\n";
$paystr = substr($paymentdate, 0, $start);
echo $paystr . "\n";
$paystr1 = substr($paymentdate, $start);
echo $paystr1 . "\n";
$paytime = strtotime($paystr);
echo $paytime . "\n";
$mdate = date('Y-m-d h:i:s', $paytime);
echo $mdate . "\n";