Convert Date Time Format as dd-mm-yyyy hh:mm:ss in Javascript

function js_yyyy_mm_dd_hh_mm_ss () {
  now = new Date();
  year = "" + now.getFullYear();
  month = "" + (now.getMonth() + 1); if (month.length == 1) { month = "0" + month; }
  day = "" + now.getDate(); if (day.length == 1) { day = "0" + day; }
  hour = "" + now.getHours(); if (hour.length == 1) { hour = "0" + hour; }
  minute = "" + now.getMinutes(); if (minute.length == 1) { minute = "0" + minute; }
  second = "" + now.getSeconds(); if (second.length == 1) { second = "0" + second; }
  return day + "-" + month + "-" + year + " " + hour + ":" + minute + ":" + second;
 
}