Day of the Week Calculator

How to work out the day of the week by hand

Start from a date whose weekday you know, then count the days. January 1, 2026 was a Thursday. October 18 is day 291, so it comes 290 days later. That is 41 weeks and 3 days, and 3 days after Thursday is Sunday. Across years, a date moves one weekday on, or two when February 29 comes in between.

The calculator uses the Gregorian calendar for every year. Britain and its colonies took it up in 1752, and Catholic Europe in 1582.

Weekdays of holidays coming up

Halloween, October 31, 2026, is a Saturday. Veterans Day is Wednesday, November 11. Thanksgiving, November 26, is a Thursday, and so is Christmas Eve, December 24. Christmas is Friday, December 25. New Year's Eve, December 31, is a Thursday, and New Year's Day, January 1, 2027, is a Friday. Martin Luther King Jr. Day is Monday, January 18.

The doomsday dates share a weekday all year: 4/4, 6/6, 8/8, 10/10, 12/12, 5/9, 9/5, 7/11, 11/7 and the last day of February. In 2026 every one of them is a Saturday, and in 2027 a Sunday.

Pick a date

Each of the 366 dates, February 29 included, has a page with its weekday in every year from 1950 to 2049. It also gives the day of the year, the moon phase and the holidays that land on it. Today's page is October 18, a Sunday in 2026 and a Monday in 2027.