The Day of the Week Calculator finds which day of the week any date falls on, plus the day of the year.
2026-11-10 is a Tuesday
| Day of the week | Tuesday |
| Day of the year | 314 |
| Leap year | No |
The calculator uses the Gregorian calendar to find the weekday of any date. Example (defaults): November 10, 2026 is a Tuesday, the 314th day of the year.
Zeller's congruence and John Conway's "Doomsday" rule let you work out weekdays mentally. In the Doomsday method, certain easy dates each year (4/4, 6/6, 8/8, 10/10, 12/12, the last day of February) always fall on the same weekday.
The Gregorian calendar repeats every 400 years (146,097 days, exactly 20,871 weeks). A leap year happens every 4 years, except years divisible by 100 that are not divisible by 400, so 2000 was a leap year and 2100 will not be.
What day was I born? Enter your birth date.
Does it work for old dates? Yes, using the modern (proleptic Gregorian) calendar.
Why is Sunday the first day? Many calendars start weeks on Sunday; ISO 8601 starts on Monday.