java script 格式化日期时间源码

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如何在java script中按自定义的格式输出日期时间字符串，在帮助中查找了半天没有找到，在网上搜索了一下，也没有，只是找到了一些相关的函数，也不太适合，只好自己做了一个函数，下面是源码，将日期时间输出成这样的格式：“05 Jun 2007 09:05:02”

<SCRIPT LANGUAGE="JavaScript">
document.MainForm.LocalTime.value = tnGetDate();
function tnGetDate()
{
    var sMonth = ["January","February","March","April","May","June","July","August","September","October","November","December"];
    var dt = new Date();
    var s = dt.getDate() + " " + sMonth[dt.getMonth()] + " " + dt.getYear() + " " + dt.getHours() + ":" + dt.getMinutes() + ":" + dt.getSeconds();
    return s;
}

下面是改进代码，显示时间时，如果是一位数则前面补0，如"12:01:09"而不是"12:1:9"
<SCRIPT LANGUAGE="JavaScript">
document.MainForm.LocalTime.value = tnGetDate();
function tnGetDate()
{
    var sMonth = ["January","February","March","April","May","June","July","August","September","October","November","December"];
    var dt = new Date();
    var s = dt.getDate() + " " + sMonth[dt.getMonth()] + " " + dt.getFullYear() + " " + IfZero(dt.getHours()) + ":" + IfZero(dt.getMinutes()) + ":" + IfZero(dt.getSeconds());
    return s;
}
function IfZero(num) {
return ((num <= 9) ? ("0" + num) : num);
}