ajax - i have used datepicker but it always store date like 1970-01-01 -

can 1 please me? used date picker date , select today stores 1970-01-01.

$("#datepicker-1").datepicker(); }); 

and in php file stored in database:

$dt=$_post['date']; $dt1=date('y-m-d',strtotime($dt)); 

but stores 1970-01-01 no matter date choose. please me.