Date().toDateString()

would something like this make sense to be a part of Espruinos Date() class ?

Date.prototype.toDateString = function(format) {
/*
yyyy    Year,  long form (e.g., 2016).
mm      Numeric month, a number from 1 to 12.
dd      Day, a number from 1 to 31.
HH      Hour, a number from 0 to 23.
MM      Minutes, a number from 0 to 59.
ss      Seconds, a number from 0 to 61 (59 plus a maximum of two leap seconds).
*/

  if (format) {
    // yyyy
    var YYYY = this.getFullYear().toString();
    format = format.replace("yyyy",YYYY);
    // mm
    var mm = (this.getMonth() + 1).toString();
    mm = mm.length > 1 ? mm : '0' + mm;
    format = format.replace("mm",mm);
    //dd
    var dd = this.getDate().toString();
    dd = dd.length > 1 ? dd : '0' + dd;
    format = format.replace("dd",dd);
    //HH
    var HH = this.getHours().toString();
    HH = HH.length > 1 ? HH : '0' + HH;
    format = format.replace("HH",HH);
    //MM
    var MM = this.getMinutes().toString();
    MM = MM.length > 1 ? MM : '0' + MM;
    format = format.replace("MM",MM);
    //SS
    var SS = this.getSeconds().toString();
    SS = SS.length > 1 ? SS : '0' + SS;
    format = format.replace("SS",SS);
    return format; 
  }
  else {
    format = this.toString();
  } 
};

>Date().toDateString();
="Tue Jul 19 2016 08:13:46 GMT+0000"
>Date().toDateString("yyyy.mm.dd HH:MM:SS");
="2016.07.19 08:13:12"