$start_date = date("Y-m-d H:i:s", strtotime('next Saturday'));
$start_week = date("Y-m-d", strtotime("last week"));
$end_week = date("Y-m-d", strtotime("this week"));
$sat = strtotime('saturday');
$start_date = date("Y-m-d H:i:s", strtotime('Saturday'));
$start = strtotime('2 weeks ago');
			

			
if(strftime('%Y-%m-%d',strtotime('2009-04-19')) <= date('Y-m-d')){
	to-do ...
}