Day of the Week
Find out which day of the week any date falls on — your birthday, a historic event or a future deadline.
- Your data never leaves your device
- 100% free
- No sign-up
- Works offline after first load
How to find the day of the week
- Pick a date (or paste several in “Many dates”).
- Read the weekday, which week and day of the year it is, and how far from today.
- Check the same date in other years or copy the result.
About Day of the Week
Find the day of the week for any date. It works in your browser, so it is instant and private.
Everything you set is remembered on your device, and the result can be copied, shared or printed. The page works offline after the first visit.
Good for
- Birthdays and anniversaries
- Historical dates and trivia
- Planning events years ahead
Tip: Paste a column of dates from a spreadsheet into “Many dates” to label each with its weekday.
Frequently asked questions
What day of the week was I born?
Pick your birth date — the weekday appears instantly, with the same date in the following years so you can see which weekday your birthday falls on.
How does the calculator work?
It counts the days from a fixed reference date. Every ordinary year shifts a date by one weekday (365 = 52 weeks + 1 day) and a leap year by two.
Can I check many dates at once?
Yes — open “Many dates”, paste a list in any format (15/08/1947, July 20 1969, 2000-01-01) and get the weekday of each.
Does it work for old dates?
Yes, using the proleptic Gregorian calendar (the modern calendar extended backwards). Dates before 1582 in historical sources may use the Julian calendar.
What is a leap year?
A year with 366 days, adding 29 February. It happens every 4 years, except years divisible by 100 that aren't divisible by 400 — so 2000 was a leap year but 1900 wasn't.