JS Date "yyyy-mm-dd hh:mm:ss" format

toYyyymmddhhmmss.js

(function() {
  "use strict";
  Date.prototype.toYyyymmddhhmmss = function() {
    var yyyy = this.getFullYear(),
        mm   = this.getMonth()   < 9  ? ("0" + (this.getMonth() + 1)) : (this.getMonth() + 1),
        dd   = this.getDate()    < 10 ? ("0" + this.getDate())    : this.getDate(),
        hh   = this.getHours()   < 10 ? ("0" + this.getHours())   : this.getHours(),
        min  = this.getMinutes() < 10 ? ("0" + this.getMinutes()) : this.getMinutes(),
        ss   = this.getSeconds() < 10 ? ("0" + this.getSeconds()) : this.getSeconds();
    return "".concat(yyyy).concat("-")
             .concat(mm)  .concat("-")
             .concat(dd)  .concat(" ")
             .concat(hh)  .concat(":")
             .concat(min) .concat(":")
             .concat(ss)
  };
})()