Date to Day Calculator - Find Day of Week for Any Date
Find what day of the week any date falls on. Shows day name, day of year, and week number. Perfect for planning events, checking historical dates, and date calculations.
Date to Day Calculator
Find what day of the week any date falls on. Perfect for planning events, checking historical dates, verifying birthdays, and any situation where you need to know the day of the week for a specific date. Also shows day of year and week number.
How It Works
Enter any date and the calculator shows:
- Day of Week: Monday, Tuesday, Wednesday, etc.
- Day of Year: Day number within the year (1-365/366)
- Week Number: ISO week number (1-53)
- Year: The year of the date
Common Use Cases
Event Planning
Find what day your event falls on:
- Birthday parties
- Weddings
- Holidays
- Anniversaries
Historical Dates
Check what day historical events occurred:
- Historical events
- Personal milestones
- Important dates
Future Planning
Plan ahead by checking future dates:
- Vacation dates
- Deadlines
- Appointments
Day of Year
Day of year is the sequential day number within the year:
- January 1: Day 1
- February 1: Day 32
- March 1: Day 60 (or 61 in leap years)
- December 31: Day 365 (or 366 in leap years)
Useful for tracking progress through the year.
Week Number
ISO week number indicates which week of the year:
- Week 1: First week with a Thursday
- Week 26: Mid-year (around June)
- Week 52/53: End of year
Some years have 53 weeks instead of 52.
Examples
New Year's Day 2025
Date: January 1, 2025
Day: Wednesday
Day of Year: 1
Week Number: 1
Independence Day 2025
Date: July 4, 2025
Day: Friday
Day of Year: 185
Week Number: 27
Leap Years
Leap years (divisible by 4, except century years not divisible by 400) have 366 days:
- 2024: Leap year (366 days)
- 2025: Common year (365 days)
- 2026: Common year (365 days)
This affects day of year calculations.
Tips for Using Date to Day
- Plan events: Check what day your event falls on
- Verify dates: Confirm important dates are on the right day
- Track progress: Use day of year to track year progress
- Historical research: Find day of week for historical dates
Day of Week Patterns
Days of the week follow predictable patterns:
- Same date next year: Usually moves forward 1 day (2 days after leap year)
- Monthly patterns: First of month day varies
- Holiday patterns: Some holidays always fall on same day
Planning Tip: When planning events, always check what day of the week your date falls on. This helps ensure your event is on a convenient day (like a weekend for parties) and helps with scheduling. The day of year is also useful for tracking progress toward annual goals!