javascript - jQuery datepicker keeps returning mm/dd/yyyy -

i have jquery datepicker defined in code this:

$fromdate = strtotime($vacancy[0]->vacancy_visibility_start_date); $fromdate = date('d/m/y',$fromdate); $calendarfromarray = array(     'name' => 'datepicker',     'id' => 'datepicker',     'value' => $fromdate ); 

my js looks this:

$( "#datepickerfrom" ).datepicker({     dateformat: 'dd-mm-yy' }); $( "#datepickerto" ).datepicker({     dateformat: 'dd-mm-yy' }); 

even though datepicker appears , works date remains in mm/dd/yyyy format.