This example demonstrates how javascript formats a specified date object. Share with you for your reference. The details are as follows:

/*
*  formatting Date The object is:" 2015-04-17 10 : 20 : 00 "
* var dateObj = new Date();
*/
function formartDate(dateObj){
  var updatetimeval =dateObj.getFullYear()+"-"+(dateObj.getMonth()+1)+"-" +dateObj.getDate()
   +" "+dateObj.getHours()+":"+dateObj.getMinutes()+":"+dateObj.getSeconds();
  return updatetimeval;
}

I hope this article has been helpful to your javascript programming.