Day of the Week Calculator
Choose any date, past or future, to see the weekday it lands on. You also get the day of the year, the days left in the year and the week number.
Type a number and the answer appears straight away.
The math behind it: Day of the Week
weekday = (days since a known reference date) mod 7
The week repeats every seven days, so the weekday of any date can be found by counting the days from a date whose weekday is known and taking the remainder after dividing by seven. January 1, 2000 was a Saturday, and July 4, 1776 was a Thursday.
Common questions
How do I find out what day of the week I was born?
Enter your date of birth above. The calculator shows the weekday straight away, for any date in the calendar.
What day of the week was January 1, 2000?
A Saturday.
Does the same date fall on the same weekday every year?
No. A normal year is 52 weeks and one day long, so each date moves forward one weekday a year, and two after a February 29.
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