What day was I born?
Enter your birth date to find the weekday you were born on. The calculator returns the weekday name and ISO weekday number, where Monday is 1 and Sunday is 7.
Historical date lookup
Day-of-week lookup is useful for birthdays, anniversaries, historical events, deadlines and archive research. For example, 4 July 1776 was a Thursday.
How day-of-week is calculated
The calculator uses standard calendar date arithmetic, equivalent to algorithms such as Zeller's Congruence, to determine the weekday for the selected date.