How Can I Convert Seconds to HH:MM:SS Format in JavaScript?

Converting Seconds to HH-MM-SS Format in JavaScript

A common task when working with timestamps is converting seconds to a human-readable format. In JavaScript, this can be achieved without external libraries using the Date method.

Solution:

The following JavaScript code snippet demonstrates how to convert seconds to an HH-MM-SS string:

const date = new Date(null);
date.setSeconds(SECONDS); // Replace SECONDS with the number of seconds
const result = date.toISOString().slice(11, 19);

Explanation:

1. Creating a Date object: We create a Date object with a null value, which represents a timestamp of 0.
2. Setting seconds: We set the seconds of the Date object to the specified number of seconds.
3. Extracting the HH-MM-SS string: We convert the Date object to an ISO string and then slice off the HH-MM-SS portion (from index 11 to 19).

Example:

To convert 600 seconds to HH-MM-SS, we would use the following code:

const date = new Date(null);
date.setSeconds(600);
const result = date.toISOString().slice(11, 19);

console.log(result); // Output: "00:10:00"

Alternative One-Line Solution:

As suggested by Frank in the comments, a one-line alternative can be written as:

new Date(SECONDS * 1000).toISOString().slice(11, 19);

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