How to Calculate the Time Difference Between Two Datetime Strings?

Time Difference Calculation

Problem: Determine the time difference between two provided datetime strings.

Example:

var now = "04/09/2013 15:00:00";
var then = "04/09/2013 14:20:30";

// Expected output: "00:39:30"

Solution:

For durations less than 24 hours:

moment.utc(moment(now, "DD/MM/YYYY HH:mm:ss").diff(moment(then, "DD/MM/YYYY HH:mm:ss"))).format("HH:mm:ss")

For durations of 24 hours or greater:

var ms = moment(now, "DD/MM/YYYY HH:mm:ss").diff(moment(then, "DD/MM/YYYY HH:mm:ss"));
var d = moment.duration(ms);
var s = Math.floor(d.asHours()) + moment.utc(ms).format(":mm:ss");

Using a Moment.js plugin:

Moment-Duration-Format

var s = d.format("hh:mm:ss");

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