Day of the Week Calculator
Find out what day of the week any date falls on
Select a Date
Select any date to see what day of the week it falls on
Or Select Components Individually
Quick Examples
Days of the Week
How It Works
Uses the Gregorian calendar system
Accounts for leap years automatically
Works for dates from 1900 to 2100+
Uses JavaScript's built-in date functions
Quick Tips
Perfect for finding your birth day
Useful for planning events and meetings
Great for historical date research
Helps with scheduling recurring events
Understanding Day of the Week Calculations
Calendar Systems
The Gregorian calendar, introduced by Pope Gregory XIII in 1582, is the most widely used calendar system today. It refined the Julian calendar by adjusting the leap year rule to more accurately reflect Earth's orbital period around the Sun.
Leap Years
- •Divisible by 4: Usually a leap year
- •Divisible by 100: Not a leap year
- •Divisible by 400: Is a leap year
Historical Context
Ancient Origins
The seven-day week originated in ancient Babylon and was later adopted by the Romans, who named the days after celestial bodies and their gods.
Cultural Variations
Different cultures have varying conventions for which day starts the week. Sunday is traditional in the US, while Monday is standard in most of Europe.