Javascript Date toLocaleFormat(pattern)

'use strict';//from  w ww.  j  a  va  2s  . com

Date.prototype.toLocaleFormat = Date.prototype.toLocaleFormat || function (pattern) {
        return pattern.replace(/%Y/g, this.getFullYear()).replace(/%m/g, (this.getMonth() + 1)).replace(/%d/g, this.getDate());
    };