Day of the week calculator


Year - Month - Day -
This day is week:
The date is:

What is a Day of the Week Calculator?

A Day of the Week Calculator is a tool that determines the exact day (Monday, Tuesday, etc.) for any given date in history or the future.

Why Use a Day of the Week Calculator?

  • Curiosity – Find out what day you were born or any historical event occurred.
  • Planning – Check which day a future event (e.g., birthday, wedding, or meeting) will fall on.
  • History & Research – Identify the weekday of past events for genealogy, astrology, or academic purposes.
  • Recurring Events – Determine which weekdays holidays or anniversaries fall on each year.

How Does a Day of the Week Calculator Work?

  • Manual Calculation – Formulas like Zeller’s Congruence or Doomsday Rule can be used.
  • Online Tools – Enter a date in an online calculator to instantly get the weekday.
  • Programming (Python, Excel, etc.) – Use date functions to compute the day.

When Do You Need a Day of the Week Calculator?

  • When checking the weekday of your birthday, anniversary, or other significant dates.
  • When planning events, appointments, or travel in advance.
  • When analyzing historical records or astrological predictions.
  • When curious about what day a certain date falls on.