How to Find the Day of the Week for Any Date (Past or Future)

Someone asks what day you were born, or you need to check whether next 21 February falls on a weekend. The Day of the Week Finder answers it at once.

Quick answer

Pick a date and the tool shows the weekday and the day number of the year. It works for dates in the past and the future.

Why people look this up

• Birthdays and anniversaries, for fun or for family records.
• Planning events such as weddings and exams.
• History and genealogy, to check a document's date.
• Deadlines, to know if the due date lands on a Friday or Saturday.

How the weekday is found

Calendars follow a pattern that repeats. A well-known method is Zeller's congruence, which computes the weekday from the year, month and day. The tool uses the Gregorian calendar for all dates.

Example

• 16 December 1971 was a Thursday.
• 26 March 1971 was a Friday.

Steps

1. Choose a day, month and year.
2. Read the weekday and the day number of the year (1 to 365 or 366).

Notes

• Dates before the Gregorian calendar's adoption (1582 in some countries, much later in others) may not match historical records written in the Julian calendar.
• Public holidays vary by country; use a holiday calendar for those.

For counting days between two dates, use the date difference calculator.