How Can Moment.js Be Used to Calculate and Format Time Differences in JavaScript?

Get the Difference between Time Differences

In programming, it's often necessary to calculate the difference between two dates or times. Moment.js is a popular JavaScript library that simplifies working with dates and times. In this article, we'll explore how to use Moment.js to get the time difference between two timestamps.

Using Moment.js for Time Differences

To start, we can create two Moment.js objects for our example timestamps:

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

Using the diff() method, we can get the difference between now and then:

var ms = now.diff(then);

The result of ms is a Moment.js Duration object, which represents the time difference in milliseconds. To format the duration as a readable string, we can use:

var result = moment.utc(ms).format("HH:mm:ss");

This gives us the expected result: "00:39:30".

Handling Durations over 24 Hours

If the duration exceeds 24 hours, the above approach will reset the hours to zero. To handle this, we can manually extract the hours and separately format the minutes and seconds:

var d = moment.duration(ms);
var hours = Math.floor(d.asHours());
var mins = d.minutes();
var secs = d.seconds();

var result = hours + ":" + mins + ":" + secs; // e.g. "48:39:30"

Alternatively, you can use a third-party plugin like moment-duration-format for more convenient formatting options.

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