How to convert milliseconds to a date in JavaScript

To convert milliseconds to date in JavaScript:

  1. Use the Date() constructor, e.g. new Date(milliseconds).
  2. The Date() constructor takes an integer value that represents the number of milliseconds since Unix Epoch and returns a Date object.
const millis = new Date().getTime()
console.log(millis) // 1662835534329

// Convert Milliseconds to Date
const date = new Date(millis)

console.log(date.toUTCString())
// Sat, 10 Sep 2022 18:45:34 GMT

In the above example, we used the Date() constructor to convert milliseconds to date.

The getTime() method returns the number of milliseconds elapsed between January 1st, 1970, at 00:00:00 UTC and the given date.

You don't need to use the getTime() method for milliseconds-to-date conversion. We only used this method to get a reasonable number of milliseconds for the Date() constructor.

Let us look at another example that uses a predefined number of milliseconds for the Date() constructor:

const millis = 1631300179955

// Convert Milliseconds to Date
const date = new Date(millis)

console.log(date.toUTCString())
// Fri, 10 Sep 2021 18:56:19 GMT

The toUTCString() method converts a Date object to a UTC string in JavaScript.

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