How does it know which weekday a date fell on?

It uses the browser's built-in calendar, which follows the proleptic Gregorian calendar, to determine the day of the week for the date you enter — the same arithmetic any modern computer uses.

What is the Monday's Child rhyme?

Monday's Child is a traditional fortune-telling nursery rhyme that assigns a trait to each day of the week — for example, Monday's child is fair of face. The tool shows the line that matches your birth weekday for fun.

Is my birth date uploaded?

No. The weekday is computed locally in your browser, so your date of birth is never sent anywhere.

What Day Was I Born

Find out which day of the week you were born on.

What day of the week were you born?

Enter your date of birth and this tool reveals which day of the week you were born on — and shares the matching line from the traditional Monday’s Child nursery rhyme for a bit of fun.

The weekday is worked out with your browser’s built-in Gregorian calendar, so the calculation happens entirely on your device and nothing is uploaded.