What weekday was I born on?
"Monday's child", "Sunday's child" — many sayings surround the weekday of birth. But which day were you actually born on? This can be determined exactly, because every calendar date maps unambiguously to a weekday.
The quickest way to find out is the <a href="/en/age-calculator">Age Calculator</a>: enter your date of birth and the weekday of your birth is shown alongside your age and the days you have lived.
How the calculation works
Our calendar — the Gregorian calendar — follows a fixed pattern of 400-year cycles. Within this cycle the sequence of weekdays repeats exactly. A computer determines the weekday by counting the number of days since a known reference date and taking the remainder when divided by seven. For historical calculations by hand there are methods such as the Doomsday rule, but in everyday life the calculator simply does the work.
Sunday's child, Monday's child and other customs
In many cultures certain traits are said to be linked to the weekdays. The "Sunday's child", for instance, stands for luck in some traditions. A well-known English nursery rhyme assigns a character trait to each weekday. Such attributions are of course pure folklore — but it is still nice to be able to place your own birthday.
Useful for other dates too
Determining the weekday is not only handy for birthdays. Using the target date in the calculator you can also check which weekday a future event falls on — for example a milestone birthday, a wedding or a public holiday. That way you can plan ahead and see whether the day falls on a weekend.
Conclusion
The weekday of your birth can be determined unambiguously and calculated with a click. Whether out of curiosity or for planning future dates — try it directly in the <a href="/en/age-calculator">Age Calculator</a>.