javascript date difference

Question

I've looked at: Get difference between 2 dates in javascript?

And I still can't get this to work.

var difference = data.List[0].EndDate - Math.round(new Date().getTime()/1000.0) * 1000;
var daysRemaining = Math.floor(difference / 1000 / 60 / 60 / 24);
var hoursRemaining = Math.floor(difference / 1000 / 60 / 60 - (24 * daysRemaining));
var minutesRemaining = Math.floor(difference / 1000 / 60 - (24 * 60 * daysRemaining) - (60 * hoursRemaining));
var secondsRemaining = Math.floor(difference / 1000 - (24 * 60 * 60 * daysRemaining) - (60 * 60 * hoursRemaining) - (60 * minutesRemaining));

data.List[0].EndDate is a UTC number (like: 1291427809310 (http://www.epochconverter.com/)) that will always be later than the current date.

Answer 1

function days_between(date1, date2) {

    // The number of milliseconds in one day
    var ONE_DAY = 1000 * 60 * 60 * 24

    // Convert both dates to milliseconds
    var date1_ms = date1.getTime()
    var date2_ms = date2.getTime()

    // Calculate the difference in milliseconds
    var difference_ms = Math.abs(date1_ms - date2_ms)

    // Convert back to days and return
    return Math.round(difference_ms/ONE_DAY)

}

http://www.mcfedries.com/javascript/daysbetween.asp

Answer 2

You say that UTC timestamp is "2004-09-16T23:59:58.75"?

So you are basically doing

var x = "2004-09-16T23:59:58.75" - 123456

Now that you clarified that, than the above does not apply. You new issue is the number of milliseconds is in the past so when you do the difference calculation, you are getting a negative number. You probably want to swap the order around.

var difference = new Date().getTime()-data.List[0].EndDate;