Попробуйте это:
//initial format
echo '0:00:00.000 GMT Mon Nov 22 2010';
//unix format: 2010-11-22
echo date('Y-m-d',strtotime('0:00:00.000 GMT Mon Nov 22 2010'));
//explicit format: Monday 22 November 2010
echo date('l d F Y',strtotime('0:00:00.000 GMT Mon Nov 22 2010'));