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Find out what day of the week any date falls on — past, present, or future.
The calculator uses JavaScript's built-in Date object, which accurately computes the day of the week based on the Gregorian calendar for dates from 1970 onward.
The Gregorian calendar was adopted at different times worldwide. For dates before the adoption in your region, the day of week may differ from historical records.
Day of year is a number from 1 to 366 representing the sequential day count within a given year. January 1 is day 1, December 31 is day 365 (or 366 in a leap year).
Simply enter your birth date (day, month, year) and the calculator will instantly show which day of the week it falls on for any year you specify.