📅 Day of the Week Calculator
Enter any date to find out which day of the week it falls on, plus how many days ago or from now it is.
Day of the week
How the Day of the Week Calculator works
Your browser's calendar engine applies the Gregorian calendar rules (including leap years) to find the weekday. Dates before 1582 use the same rules extended backward.
Weekday = Gregorian calendar day count mod 7 (Zeller-style congruence)
Step-by-step calculation
- 1Pick any date.
- 2The Gregorian calendar rules are applied.
- 3Read the weekday and how far the date is from today.
Worked example
July 4, 1776 was a Thursday, and January 1, 2000 was a Saturday.
Day of the Week Calculator examples
| Date | Day of the week |
|---|---|
| Jul 4, 1756 | Sunday |
| Jul 4, 1766 | Friday |
| Jul 4, 1776 | Thursday |
| Jul 4, 1786 | Tuesday |
| Jul 4, 1796 | Monday |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Day of the Week Calculator?
Find which day of the week a birthday, event or historical date fell on.
Important factors that can affect your results
- Very old dates may differ from history books that used the Julian calendar.
- Typing the year incorrectly (for example 26 instead of 2026).
- Local time zone near midnight.
Frequently asked questions
Why might old dates differ from history books?
Before countries adopted the Gregorian calendar, they used the Julian calendar, so very old dates may be recorded differently.
Can I check future dates?
Yes, any year from 1 to 9999.
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Last reviewed November 2026 · How we build and check our tools · Report a problem