Improvised from: http://www.bigroom.co.uk/blog/dates-in-php-and-mysql
$mysqldate = date( 'Y-m-d', strtotime( $phpdate ) );
// Example:
$phpdate = 'November 20, 2009';
$mysqldate = date( 'Y-m-d', strtotime( $phpdate ) );
echo $mysqldate;
// output: 2009-11-20