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Day of Week Calculator

Find out what day of the week any date falls on — past, present, or future. Also shows week number, day of year, and quarter.

Real-time results 100% free No sign-up Mobile friendly

Formulas verified against authoritative sources including the CFPB and Federal Reserve. Last reviewed . Editorial policy.

Enter a Date

Results

Saturday

May 16, 2026

Sun
Mon
Tue
Wed
Thu
Fri
Sat

Day of Year

Day 137

Week Number

Week 20

Quarter

Q2

Days Left in Year

228 left

Frequently Asked Questions

What day was January 1, 2000?

January 1, 2000 was a Saturday. This was a significant date as it was the year 2000 (Y2K) and the start of the new millennium (though technically the millennium started on January 1, 2001).

How do I calculate the day of the week mentally?

The Doomsday algorithm (invented by John Conway) lets you calculate any day in your head. Anchor days for each year are the same day of the week, and you calculate offsets from there. It's a useful party trick but requires memorizing several tables!

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