Calculate Time Difference with JavaScript

Question

I have two HTML input boxes, that need to calculate the time difference in JavaScript onBlur (since I need it in real time) and insert the result to new input box.

F

Answer 1

This is an updated version of one that was already submitted. It is with the seconds.

function diff(start, end) {
    start = start.split(":");
    end = end.split(":");
    var startDate = new Date(0, 0, 0, start[0], start[1], 0);
    var endDate = new Date(0, 0, 0, end[0], end[1], 0);
    var diff = endDate.getTime() - startDate.getTime();
    var hours = Math.floor(diff / 1000 / 60 / 60);
    diff -= hours * (1000 * 60 * 60);
    var minutes = Math.floor(diff / 1000 / 60);
    diff -= minutes * (1000 * 60);
    var seconds = Math.floor(diff / 1000);

    // If using time pickers with 24 hours format, add the below line get exact hours
    if (hours < 0)
       hours = hours + 24;

    return (hours <= 9 ? "0" : "") + hours + ":" + (minutes <= 9 ? "0" : "") + minutes + (seconds<= 9 ? "0" : "") + seconds;
}

My Updated Version:

Allows for you to convert the dates into milliseconds and go off of that instead of splitting.

Example Does -- Years/Months/Weeks/Days/Hours/Minutes/Seconds

Example: https://jsfiddle.net/jff7ncyk/308/