<pre><code>function curDateTime() {
   var d = new Date();
   var year = d.getFullYear();
   var month = d.getMonth() + 1;
   var date = d.getDate();
   var day = d.getDay();
   var curDateTime = year;
   if (month > 9)
      curDateTime = curDateTime + "-" + month;
   else
      curDateTime = curDateTime + "-0" + month;
   if (date > 9)
      curDateTime = curDateTime + "-"  + date;
   else
      curDateTime = curDateTime + "-0" + date;
   return curDateTime;

}
curDateTime()
"2019-03-21"