Day of the Week Calculator
Enter any date to find out which day of the week it falls on. Perfect for planning events, checking historical records, or finding your own birth day.
How does the Day of the Week Calculator work?
The calculator uses Zeller's congruence, an algorithm devised by Christian Zeller in the 19th century, to calculate the day of the week for any date in the Julian or Gregorian calendar.
Can I find the day of the week for a historical date?
Yes, this calculator supports historical dates. However, keep in mind that many countries switched from the Julian to the Gregorian calendar at different times (e.g., Britain in 1752, Russia in 1918), which can affect historical day calculations.
What is a leap year and how does it affect the calculation?
A leap year occurs every four years to keep our calendar in alignment with the Earth's revolutions around the Sun. Leap years add an extra day (February 29th), which shifts the day of the week for all subsequent dates in that year.
What day of the week was I born on?
Simply enter your birth date into the calculator, and it will instantly tell you whether you were born on a Monday, Tuesday, or any other day of the week!