Day of Week Finder
Find the day of the week for any date, past or future.
Pinning down the weekday
This finds which day of the week any date falls on, whether it is your birth date, a historical event, or a date far in the future. This gives the weekday instantly for any date you enter.
Enter a date to find its day of the week.
A calculation that once impressed
Determining the weekday of an arbitrary date is genuinely difficult to do in your head, which is why people who can do it quickly are met with amazement — it requires accounting for all the days and leap years between a known reference and the target date. There are clever mental methods, but the calculation does it instantly and reliably. It is satisfying for discovering the day you were born, useful for settling which weekday a future or past event falls on, and occasionally handy for historical or genealogical work where the day of the week matters. Thanks to the calendar's four-hundred-year repeating cycle of weekdays, every date has a fixed place in that long pattern, so the answer for any date, however distant, is perfectly well-defined.
Frequently asked questions
Why is finding a weekday hard mentally?
Because it requires accounting for all the days and leap years between a reference date and the target, which is why quick mental methods impress people.
What is it useful for?
Discovering the day you were born, settling which weekday an event falls on, or historical and genealogical work where the weekday matters.
Is anything uploaded?
No. The calculation happens in your browser.