Day of Week Calculator
Find out what day of the week any date falls on. Perfect for birthdays, historical events, or planning future dates.
Select a Date
Choose any date to find out what day of the week it is
Days of the Week
Did You Know?
📅 Gregorian Calendar
The current calendar system was introduced in 1582 by Pope Gregory XIII.
🔄 Leap Years
A leap year occurs every 4 years, except for years divisible by 100 (unless also divisible by 400).
📆 Week Numbers
ISO week numbers range from 1 to 52 (or 53 in some years).
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About Day of Week Calculator
Our Day of Week Calculator helps you find out what day of the week any date falls on. Whether you're curious about your birthday, planning future events, or researching historical dates, this tool provides instant and accurate results.
Features
- Calculate day of week for any date from 1900 to 2100
- Detailed date information including week number and day of year
- Visual day indicators with colors and emojis
- Weekend/weekday identification
- Leap year detection
- Quick access to today's date
- Random date generator for exploration
- Calculation history tracking
How to Use
- Select a date using the date picker
- Or use "Today" for current date or "Random Date" for exploration
- Click "Calculate Day" to see the results
- View detailed information about the selected date
- Check your calculation history in the sidebar
Common Use Cases
- Birthday Research: Find out what day you were born on
- Event Planning: Check what day future events will fall on
- Historical Research: Discover days of historical events
- Anniversary Tracking: See what day your anniversary falls on
- Work Planning: Identify weekends and weekdays for scheduling
- Education: Learn about calendar systems and date calculations
Understanding the Results
When you calculate a date, you'll see:
- Day of Week: The name of the day (Sunday through Saturday)
- Full Date: Complete date in readable format
- Week Number: The ISO week number of the year (1-53)
- Day of Year: Which day of the year it is (1-365/366)
- Weekend/Weekday: Whether it's a weekend or weekday
- Leap Year: Indication if the year is a leap year
About Leap Years
A leap year has 366 days instead of the usual 365. Leap years occur:
- Every year divisible by 4 (e.g., 2024, 2028)
- Except years divisible by 100 (e.g., 1900, 2100 are not leap years)
- Unless also divisible by 400 (e.g., 2000, 2400 are leap years)
Calendar Facts
- The Gregorian calendar is the most widely used civil calendar
- It was introduced by Pope Gregory XIII in October 1582
- The calendar corrected the drift in the Julian calendar system
- A regular year has 52 weeks and 1 day (52 × 7 + 1 = 365)
- A leap year has 52 weeks and 2 days (52 × 7 + 2 = 366)
Tips
- Use the "Today" button for quick access to current date
- Try "Random Date" to explore different dates throughout history
- Check the history to compare multiple dates
- Note the color coding for each day of the week
- Weekend days are highlighted for easy identification
Why Use This Calculator?
Our day of week calculator is perfect for anyone who needs to quickly determine what day a specific date falls on. It's accurate, easy to use, and provides comprehensive information about any date. Whether for personal curiosity, professional planning, or educational purposes, this tool makes date calculations simple and intuitive.