Day of the Week Calculator
Find out what day of the week any date falls on.
Why this is useful
Handy for checking what day a future deadline lands on, confirming the weekday of a historical date, or settling an argument about what day someone was born.
A calendar quirk worth knowing
Because a common year is 52 weeks plus one day, the same date usually falls one weekday later than the year before — except across a leap year, where it jumps forward two. That's why your birthday can seem to "skip" a weekday some years, and why a date that fell on a Tuesday five years ago won't reliably fall on a Tuesday again on a simple yearly pattern.
Frequently asked questions
Can I find the day of the week for a date in the past?
Yes, any past date works — a common use is checking what day of the week you were born on.
How far back does this calculation work accurately?
It's accurate for any date using the modern Gregorian calendar, which was adopted at different times in different countries (most of Europe by the late 1500s–1700s, with some places switching later).
Why might this differ from a very old historical record?
Dates recorded before a country adopted the Gregorian calendar may have used the older Julian calendar, which can be off by several days from a straight Gregorian calculation.