How to find the day of the week for any date
- Enter a date, such as your birthday, a historical event or a future appointment.
- See the weekday it falls on, the traditional "Monday's child" rhyme, the day of the year and how many days ago or ahead it is.
- Check which weekday the same date falls on in the next ten years, for example to plan birthday parties, and share the result.
How the weekday is calculated
The calculator uses Sakamoto's method, a compact version of the same arithmetic as Zeller's congruence: it counts days using the year, leap-year rules (every 4 years, except centuries not divisible by 400) and a fixed offset for each month, then takes the remainder after dividing by 7. Because 365 days is 52 weeks plus one day, a date usually moves forward one weekday each year, and two after 29 February. The calendar repeats every 400 years exactly, which is why 1 January 2000 and 1 January 2400 are both Saturdays.
The rhyme "Monday's child is fair of face…" is an English fortune-telling nursery rhyme first recorded in the 19th century, just for fun. For dates before 1583, remember that most of Europe still used the Julian calendar, which differs by 10 or more days; the result shown follows the modern Gregorian calendar extended backwards. Everything runs in your browser.
What day of the week was I born?
Enter your date of birth; the weekday appears instantly, with the matching line of the rhyme.
Why does my birthday move one day each year?
A normal year is 52 weeks and 1 day, so dates shift by one weekday, or two after a leap day.
What day was 1 January 2000?
A Saturday.