Date.prototype.getDay()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
ThegetDay() method ofDate instances returns the day of the week for this date according to local time, where 0 represents Sunday. For the day of the month, seeDate.prototype.getDate().
Try it
const birthday = new Date("August 19, 1975 23:15:30");const day1 = birthday.getDay();// Sunday - Saturday : 0 - 6console.log(day1);// Expected output: 2Syntax
getDay()Parameters
None.
Return value
An integer, between 0 and 6, representing the day of the week for the given date according to local time: 0 for Sunday, 1 for Monday, 2 for Tuesday, and so on. ReturnsNaN if the date isinvalid.
Description
The return value ofgetDay() is zero-based, which is useful for indexing into arrays of days, for example:
const valentines = new Date("1995-02-14");const day = valentines.getDay();const dayNames = ["Sunday", "Monday", "Tuesday" /* , … */];console.log(dayNames[day]); // "Monday"However, for the purpose of internationalization, you should prefer usingIntl.DateTimeFormat with theoptions parameter instead.
const options = { weekday: "long" };console.log(new Intl.DateTimeFormat("en-US", options).format(valentines));// "Monday"console.log(new Intl.DateTimeFormat("de-DE", options).format(valentines));// "Montag"Examples
Using getDay()
Theweekday variable has value1, based on the value of theDate objectxmas95, because December 25, 1995 is a Monday.
const xmas95 = new Date("1995-12-25T23:15:30");const weekday = xmas95.getDay();console.log(weekday); // 1Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-date.prototype.getday |