function  getPreviousWeek(year,month,day) {
     var  today = new  Date(year,month - 1 ,day);
     var  week = today.getDay();
     if (week == 0 ) {
          week = 7 ;
     } 
     var  monday = new  Date(today.valueOf() - (week + 6 ) * 24 * 60 * 60 * 1000 );
     var  sunday = new  Date(monday.valueOf() + 6 * 24 * 60 * 60 * 1000 );
     var prevWeek = new Object();
     prevWeek['monday'] = monday.getFullYear() + "-" + ((monday.getMonth() + 1 ).toString().length == 1 ? ( "0" + (monday.getMonth() + 1 )):(monday.getMonth() + 1 )) + "-" + (monday.getDate().toString().length == 1 ? "0" + monday.getDate():monday.getDate());
     prevWeek['sunday'] = sunday.getFullYear() + "-" + ((sunday.getMonth() + 1 ).toString().length == 1 ? ( "0" + (sunday.getMonth() + 1 )):(sunday.getMonth() + 1 )) + "-" + (sunday.getDate().toString().length == 1 ? "0" + sunday.getDate():sunday.getDate());

     return prevWeek;

   }