Calculate timespan in JavaScript

Question

I have a .net 2.0 ascx control with a start time and end time textboxes. The data is as follows:

txtStart.Text = 09/19/2008 07:00:00

txtEnd.Text = 09/19/200

Answer 1

function stringToDate(string) {
        var matches;
    if (matches = string.match(/^(\d{4,4})-(\d{2,2})-(\d{2,2}) (\d{2,2}):(\d{2,2}):(\d{2,2})$/)) {
       return new Date(matches[1], matches[2] - 1, matches[3], matches[4], matches[5], matches[6]);
    } else {
       return null;
    };
}

    function getTimeSpan(ticks) {
        var d = new Date(ticks);
        return {
            hour: d.getUTCHours(), 
            minute: d.getMinutes(), 
            second: d.getSeconds()
        }
    }

    var beginDate = stringToDate('2008-09-19 07:14:00');
    var endDate = stringToDate('2008-09-19 17:35:00');

    var sp = getTimeSpan(endDate - beginDate);
    alert("timeuse：" + sp.hour + " hour " + sp.minute + " minute " + sp.second + " second ");

you can use getUTCHours() instead Math.floor(n / 3600000);