Enter any date to find out which day of the week it falls on, with a few facts and a calendar of the month.
Every date falls on one of seven weekdays, and the pattern repeats exactly every 7 days. The calculator counts the days from a known date, in this case 1 January 1970, which was a Thursday, and uses the remainder after dividing by 7 to name the weekday. It works for any year from 1 to 9999. Because the leap year rules are built in, it handles February 29 correctly, including the century years that are not leap years, such as 1900 and 2100.
Besides the weekday, the calculator tells you which day of the year the date is, out of 365 or 366, and how many days are left. It also tells you which occurrence of that weekday it is in the year, for example the 40th Sunday, out of 52 or 53, and how many are left. A calendar for the month is shown with the date marked.
The calculator uses the Gregorian calendar, which is the one in use almost everywhere today, and applies it to every date, even those before it was adopted. The Gregorian calendar was introduced in October 1582, and countries switched at different times, so a historical date written in the old Julian calendar can fall on a different weekday. Dates before 1582 here show the weekday in the Gregorian calendar extended backwards.
Enter the month, day and year. The calculator counts the days since a known date and names the weekday for you.
Enter your date of birth. The result names the weekday, and the calendar shows the rest of that month.
Yes. A year is a leap year if it divides by 4, except century years, which must divide by 400. So 2000 and 2024 are leap years and 1900 and 2100 are not.
Dates that do not exist are moved on to the next valid date. February 30 in a leap year becomes March 1, and in other years it becomes March 2.
It uses the Gregorian calendar for all dates, so for dates before it was adopted in 1582 it shows the weekday as if the calendar had always been in use.
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