How to Add Time to Current Date in JavaScript or TypeScript

Learn how to easily add a specific time to the current date using JavaScript or TypeScript, replacing the current time with your chosen time.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Add time to current date in javascript or type script

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Add Time to Current Date in JavaScript or TypeScript

Are you looking to replace the current time in a date object with a specific time in JavaScript or TypeScript? You’re not alone! This is a common requirement for developers who want to manipulate dates and times effectively. In this guide, we’ll walk through how to achieve that using some easy-to-understand methods.

The Problem: Replacing Current Time

Let’s set the stage with an example. Suppose you have a time input like 05:17 am and a current date and time of 10-09-2021 11:30 am. You want to create a new datetime that retains the current date but replaces the time with your specific time. In other words, you want the result to be 10-09-2021 05:17 am.

Here is what we want to achieve:

Input: Current Date & Time = 10-09-2021 11:30 am

Specific Time to Add: 05:17 am

Output: New Date & Time = 10-09-2021 05:17 am

The Solution: Step-by-Step Guide

To accomplish this task, we need to manipulate a JavaScript Date object. We’ll use the setHours() method to adjust the time while keeping the date intact. Here’s how to do it:

1. Extract Hours and Minutes

We will start by extracting the hours and minutes from our specific time input. This lets us easily set the time later.

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

2. Initialize the Current Date

Next, we need to get the current date and time.

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

3. Determine the Hour Adjustment

We’ll then determine if we need to add or subtract hours based on the given time. This handles the 12-hour format properly:

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

4. Set the New Time

Finally, we will set the new hour and minute values to the Date object.

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

Example Outputs

Let’s see the results of different time inputs:

Input: '12:17 pm' → Output: 12:17:00

Input: '12:17 am' → Output: 00:17:00

Input: '05:17 am' → Output: 05:17:00

Input: '05:17 pm' → Output: 17:17:00

An Update: Without AM/PM

If you use a 24-hour format (for example, 17:17), the implementation simplifies even more:

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

Output

For the 24-hour time, the output will be straightforward as well:

Input: '05:17' → Output: 05:17:00

Conclusion

Manipulating dates and times in JavaScript or TypeScript doesn’t have to be complicated! By following the steps outlined in this guide, you can easily replace the current time in a date object with any specific time you need. Now you're ready to tackle time manipulation in your projects confidently!