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JavaScript - add milliseconds to date

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Created by:
Gigadude
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In this article, we would like to show you how to add milliseconds to date in JavaScript.

1.  Example reusable lambda function

In this example, we create a simple function that takes two arguments:

  • date to which we want to add some milliseconds,
  • milliseconds¬†- number of milliseconds¬†we want to add.

Runnable example:

// ONLINE-RUNNER:browser;

const addMilliseconds = (date, milliseconds) => {
  const result = new Date(date);
  result.setMilliseconds(result.getMilliseconds() + milliseconds);
  return result;
};

let date = new Date('2021-08-30T00:00:00.000Z');

console.log(addMilliseconds(date, 5).toISOString());  // 2021-08-30T00:00:00.005Z

Output:

2021-08-30T00:00:00.005Z

2. Extending existing Date class with Date.prototype

In this example, we add a function to the Date.prototype so we can use it on any date object.

// ONLINE-RUNNER:browser;

Date.prototype.addMilliseconds = function (milliseconds) {
  let date = new Date(this.valueOf());
  date.setMilliseconds(date.getMilliseconds() + milliseconds);
  return date;
};

let date = new Date('2021-08-30T00:00:00.000Z');

console.log(date.addMilliseconds(5).toISOString());  // 2021-08-30T00:00:00.005Z

Output: 

2021-08-30T00:00:00.005Z

JavaScript - date & time - add to / subtract from

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