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.
The getDay() method of Date instances returns the day of the week for this date according to local time, where 0 represents Sunday. For the day of the month, see Date.prototype.getDate().
Try it
const birthday = new Date("August 19, 1975 23:15:30");
const day1 = birthday.getDay();
// Sunday - Saturday : 0 - 6
console.log(day1);
// Expected output: 2
Syntax
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. Returns NaN if the date is invalid.
Description
The return value of getDay() 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 using Intl.DateTimeFormat with the options 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()
The weekday variable has value 1, based on the value of the Date object xmas95, because December 25, 1995 is a Monday.
const xmas95 = new Date("1995-12-25T23:15:30");
const weekday = xmas95.getDay();
console.log(weekday); // 1
Specifications
| Specification |
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| ECMAScript® 2027 Language Specification # sec-date.prototype.getday |
Browser compatibility
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Legend
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- Full support
- Full support