Day of the Week Calculator
Find out what day of the week any date falls on.
That date falls on a Saturday.
About this tool
This tool calculates the day of the week for any calendar date using the standard Gregorian calendar — the calendar system used across most of the world today, with its familiar leap-year rule (a leap day every 4 years, except century years not divisible by 400).
It works equally well for dates far in the past or future: enter a historical date to check what day of the week a documented event happened on, or a future date to plan around it.
This comes in handy for genealogy research, double-checking historical records, figuring out whether a recurring anniversary falls on a weekend this year, or simply settling a debate about what day a particular date fell on.
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Frequently asked questions
- How do I find out what day of the week a date was?
- Enter any date and the calculator instantly shows which day of the week it falls on, based on the standard Gregorian calendar used across most of the world today.
- Does this work for dates in the past and future?
- Yes, it works for any valid calendar date, past or future, using the same Gregorian calendar rules (including its leap-year pattern) projected forward or backward.
- Why would I need to know the day of the week for a past date?
- Genealogy research, verifying historical events or documents, checking when a recurring event (like a birthday) last fell on a weekend, and settling casual arguments about "what day was that" are all common reasons.
- Does the calendar system matter for very old dates?
- Yes — many countries switched from the Julian calendar to the Gregorian calendar at different times (Britain and its colonies in 1752, for example), which shifted dates by several days. This calculator uses the modern Gregorian calendar throughout.