Day of the Week Calculator

Any date — find out exactly what day of the week it falls on.

Works for any date, past or future, on the standard Gregorian calendar.

Day of the week
Saturday

Handy for confirming a historical date, planning a recurring event, or checking what day a future date falls on.

A worked example

January 1, 2000 — the dawn of the new millennium — fell on a Saturday.

Frequently asked questions

How does this figure out the day of the week?

It relies on the Gregorian calendar's well-defined structure — every date maps to exactly one day of the week, calculated from the total number of days elapsed since a known reference point.

Does this work for dates before standard calendar records, or far in the future?

It's accurate for any standard Gregorian calendar date, which covers the vast majority of historical and future date calculations you're likely to need.