把时间转换成时间戳

<script type="text/javascript">
function transdate(Time){
        var date=new Date();
        date.setFullYear(Time.substring(0,4));
        date.setMonth(Time.substring(5,7)-1);
        date.setDate(Time.substring(8,10));
        date.setHours(Time.substring(11,13));
        date.setMinutes(Time.substring(14,16));
        date.setSeconds(Time.substring(17,19));
        return Date.parse(date)/1000;

}

document.write(transdate('2014-11-11 00:00:00'));
</script>