mongoで時間出力の見た目を整形したくてjavascript書きました javascript力がなさすぎて悲しくなる javascript date format

date_format_sample.js

var dformat = function(d){
  var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
  var date = new Date(utc);
  var tos = function(t){
    if(t < 10) return "0" + t;
    return "" + t;
  }
  var y = tos(date.getFullYear());
  var M = tos(date.getMonth() + 1);
  var d = tos(date.getDate());
  var h = tos(date.getHours());
  var m = tos(date.getMinutes());
  var s = tos(date.getSeconds());
  var ymd = [ y, M, d].reduce(function(tmp,val){return tmp + "-" + val});
  var hms = [ h, m, s].reduce(function(tmp,val){return tmp + ":" + val});
  return ymd + " " + hms;
};