How to Find the Difference of Two Times Using Moment.js

Learn how to calculate the time difference between two moments in JavaScript using Moment.js, considering potential changes across days.
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How to Find the Difference of Two Times Using Moment.js

Time calculations can often become tricky, especially when working with times that cross over to the next day, like from late evening to early morning. In this guide, we will explore how to determine the difference between two times using Moment.js, a versatile JavaScript library for parsing and manipulating dates and times.

The Problem

Let’s say you have two time points:

Start Time: 20:00 (8:00 PM)

End Time: 05:00 (5:00 AM)

In addition to these times, let’s consider an important factor—days. If your days variable is set to 1, it indicates that the end time falls on the next day, which is crucial for the time difference calculation.

Your task is to calculate the time difference between the start time and end time, and display the result in hours and minutes along with the date the end time falls on. We can also note that if days is set to 0, the end time will be the same date as the start time.

Expected Output

For the inputs above, the expected output should read:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

Let's break down the steps required to achieve this using Moment.js:

Step 1: Initial Setup

First, ensure that you have Moment.js included in your project. You can download it or link to a CDN. Then, we will set up our initial variables.

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Step 2: Calculate Day Duration

Next, we need to account for the day difference. We'll convert the number of days into milliseconds. This is essential, especially when the end time is on the next day.

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Step 3: Calculate Total Milliseconds

To find the total time between the start and end, we need to calculate the difference in milliseconds first. We will then add this to the milliseconds of the days.

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Step 4: Create a Moment Duration Object

To make our final result easier to work with, we create a Moment Duration object from our calculated milliseconds.

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Step 5: Format the Output

Finally, we will format our output to show the hours and minutes clearly.

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Now, if you run the above code, it should return:

[[See Video to Reveal this Text or Code Snippet]]

Step 6: Display the End Date

To extend the output to include the date of the end time, we could further manipulate our moment object:

[[See Video to Reveal this Text or Code Snippet]]

This will yield the complete output with both time difference and the correct date.

Conclusion

Calculating the difference between two times can seem challenging, but with Moment.js, it becomes straightforward. By considering factors like crossing over days and properly utilizing Moment's methods, you can easily fetch the required time difference in a readable format.

Now you can confidently perform time calculations in your JavaScript applications using Moment.js!

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