Day of the Week Calculator

Enter any date to find out which day of the week it falls on.

Which weekday is that?

Knowing the weekday of a date is one of those small needs that comes up constantly: scheduling an event, checking when a holiday falls, or confirming a delivery window. This tool returns the day of the week for any date, past or future.

Weekdays drive a surprising amount of planning, since business hours, deliveries, and appointments usually run Monday to Friday. Pair it with the date calculator to plan a date a set time away and immediately see which day it lands on.

The formula

derived from the calendar date

Worked example

A common use is checking which weekday a future birthday or holiday will be.

How to read your result

Knowing the weekday helps with planning events, deliveries, and appointments. It works for past and future dates alike.

Frequently asked questions

Does it work for past dates?: Yes, any valid date past or future.
Why does the weekday matter?: Many plans depend on whether a date is a weekday or weekend.
Is it accurate for old dates?: It uses the standard calendar your device follows.

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