How day of week calculator works
Every date maps to a weekday, but the pattern is not obvious — leap years and the lengths of the months shift the weekday forward each year. A day-of-week calculator works it out directly from the date using the calendar rules, without you having to count on a calendar.
This calculator parses a date and returns the full weekday name (like Saturday), the abbreviated form (Sat), the day of the month, the month name, and the year, plus an ordinal date string like "15th June 2024". It works for any date the JavaScript Date object can represent, past or future.
Enter a date and click Find Day. Use it to find what day of the week you were born, plan events around weekdays, or check historical dates. The result is consistent across time zones because the calculator uses the calendar date you enter at local midnight.