Day of the Week

Enter any date to instantly see the full day-of-the-week name (Monday, Tuesday, etc.) and the formatted date. This works for any date — past, present, or future.

Common uses include finding out what day of the week a birthday or holiday falls on, checking historical dates, or planning future events. The calculator defaults to today's date on load.

The arithmetic uses the proleptic Gregorian calendar — applied uniformly to past, present, and future — and so respects the leap-year rule that gives February an extra day in years like 2024 and 2028.