What Day of the Week Calculator
Enter any date to find out what day of the week it falls on. Works for past and future dates from 1900 to 2041.
What Day of the Week Calculator
How It Works
This calculator determines the day of the week for any date between 1900 and 2041. It uses the Gregorian calendar, which repeats in a 400-year cycle. The algorithm accounts for leap years — years divisible by 4 are leap years, except for century years (like 1900), unless they are also divisible by 400 (like 2000).
Notable Dates
| Date | Day | Event |
|---|---|---|
| July 20, 1969 | Sunday | Moon landing (Apollo 11) |
| November 9, 1989 | Thursday | Fall of the Berlin Wall |
| January 1, 2000 | Saturday | Start of the 21st century |
| September 11, 2001 | Tuesday | 9/11 attacks |
| February 29, 2024 | Thursday | Most recent leap day |
| July 4, 2026 | Saturday | U.S. Independence Day 2026 |
| December 25, 2026 | Friday | Christmas 2026 |
| January 1, 2030 | Tuesday | Start of the 2030s |
About This Calculator
The What Day of the Week Calculator covers dates from January 1, 1900 to December 31, 2041. For each date, it shows the day of the week, the day number within the year, how many days ago or until that date, and a full calendar of the month. You can navigate by selecting a year, month, and day from the form above, or browse the year pages to see all dates at once.
Related Calculators
- Day & Week Number — What week and day of the year is it?
- Leap Year Calculator — Is any year a leap year?
- Age Calculator — Calculate your exact age.
- U.S. Holidays — Dates, countdowns, and info.
- Days Ago Calculator — How many days since any date.
Frequently Asked Questions
How do I find what day of the week a date falls on?
Select a year, month, and day using the calculator above and click Calculate.
Does it work for future dates?
Yes. The calculator works for dates from 1900 to 2041.