Date.prototype.getDay()

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().

The return value of getDay() is zero-based, which is useful for indexing into arrays of days, for example:

However, for the purpose of internationalization, you should prefer using Intl.DateTimeFormat with the options parameter instead.

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.

Syntax example: getDay()