Free day of the week calculator
What day of the week is it?
Find the day of the week for any date, past or future. Click a day in the calendar or enter a date.
2027
The first day of each month in 2027
| Date | Day of the week |
|---|---|
| 1 January 2027 | Friday |
| 1 February 2027 | Monday |
| 1 March 2027 | Monday |
| 1 April 2027 | Thursday |
| 1 May 2027 | Saturday |
| 1 June 2027 | Tuesday |
| 1 July 2027 | Thursday |
| 1 August 2027 | Sunday |
| 1 September 2027 | Wednesday |
| 1 October 2027 | Friday |
| 1 November 2027 | Monday |
| 1 December 2027 | Wednesday |
How it works
How the weekday of a date is worked out
The calculator counts whole days from a fixed starting point to the date you choose and divides by 7: the remainder gives the weekday. Every date is handled as a calendar day in UTC, so daylight saving changes never shift the answer.
By hand, the best known method is Zeller’s congruence, which combines the day, the month, the year and the century in one formula. A quicker trick is the doomsday rule: in any year, 4/4, 6/6, 8/8, 10/10 and 12/12 all fall on the same weekday.
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FAQ
Day of the week calculator, answered
Anything we have not answered here, ask us directly. A senior engineer replies.
What day of the week was I born?
Enter your date of birth and the calculator shows the weekday at once. The age calculator also shows it, along with the day of the week of your next birthday.
Why does a date move one weekday each year?
A common year has 365 days, which is 52 weeks and 1 day, so the same date falls one weekday later the next year. After 29 February in a leap year, it moves two.
Does it work for old dates?
Yes, on the Gregorian calendar. Most of Europe switched to it from 1582 onward and Britain and its colonies in 1752, so for earlier dates in those places the weekday on the calendar used at the time can differ.
What else does it show?
The ISO week number, the day of the year, the days left in the year, the quarter, the number of days in that month, whether the year is a leap year, and the weekday of the same date next year.
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