Date

 <script language="javascript" type="text/javascript">

        //第一种参数

        var someDate=new Date(2008,05,20,12,00,00);

        document.write(someDate,"<br />");

        //第二种参数

        someDate=new Date("july 20 2008 12:30:30");

        document.write(someDate,"<br />");

        //获取系统当前日期

        var today=new Date();

        document.write(today,"<br />");

        document.write("某特定时间的星期为"+today.getDay()+"<br />");//0代表星期日

        document.write("某特定时间的日子为"+today.getDate()+"<br />");

        document.write("某特定时间的月份为"+(today.getMonth()+1)+"<br />");//月从0月开始

        document.write("某特定时间的年份为"+today.getFullYear()+"<br />");

        document.write("某特定时间的小时为"+today.getHours()+"<br />");

        document.write("某特定时间的分钟为"+today.getMinutes()+"<br />");

        document.write("某特定时间的秒为"+today.getSeconds()+"<br />");

        //通过setDate方法修改日期，其他类似

        today.setDate(25);

        document.write("修改后的日期为"+today.getDate()+"<br />");

    </script>