format

function format(date, fmt){
        var o = {
          "M+": date.getMonth() + 1,
          "d+": date.getDate(),
          "h+": date.getHours(),
          "m+": date.getMinutes(),
          "s+": date.getSeconds(),
          "q+": Math.floor((date.getMonth() + 3) / 3),
          "S": date.getMilliseconds()
        };
        if (/(y+)/.test(fmt)) {
          fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
        }
        for (var k in o) {
          if (new RegExp("(" + k + ")").test(fmt)) {
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
          }
        }
        return fmt;
}
alert(format(new Date(),"yyyyMMddhhmmss"));