Question

I need to get time difference in this format: “HH:MM:SS” using a Javascript.

I have tried this:

var diff = Date.parse( time2) - Date.parse( time1 );
var total_time = (diff / 1000 / 60 / 60) + ":" + (diff / 1000 / 60) + ":" + (diff / 1000);

and this:

var diff = new Date( time2) - new Date( time1 );
var total_time = (diff / 1000 / 60 / 60) + ":" + (diff / 1000 / 60) + ":" + (diff / 1000);

These are the values of time2 and time1:

time1: "2012-11-07 15:20:32.161"
time2: "2012-11-07 17:55:41.451"

And result I am getting in both cases is:

total_time= 0.5250819444444444:31.504916666666666:1890.295

Which you can see is not correct

Answer 1

You forgot to remove the number of milliseconds you already calculated from diff. Here is a very verbose example on how you do it in a propper way.

var time1 = "2012-11-07 15:20:32.161",
    time2 = "2012-11-07 17:55:41.451",

    SECOND = 1000,
    MINUTE = SECOND* 60,
    HOUR = MINUTE* 60;

var diff = new Date(time2) - new Date(time1);

var hours = Math.floor(diff / HOUR); // Calculate how many times a full hour fits into diff
diff = diff - (hours * HOUR); // Remove hours from difference, we already caluclated those
var minutes = Math.floor(diff / MINUTE); // Calculate how many times a full minute fits into diff
diff = diff - (minutes * MINUTE); // Remove minutes from difference
var seconds = Math.floor(diff / SECOND); // As before
diff = diff - (seconds * SECOND);
var rest = diff;

var total_time = hours + ":" + minutes + ":" + seconds + " " + rest ;

DEMO