Calendar Calculator
Add or subtract time periods from any date - years, months, weeks, and days
Calendar Date Calculation
Choose the starting date for your calculation
Choose whether to add or subtract the time period
Enter any combination of time periods. All fields are optional.
Example Calculations
Example 1: Project Deadline
Start: Today
Add: 2 months, 3 weeks, 5 days
Result: Find the exact deadline date for a project
Example 2: Historical Event
Start: January 1, 2025
Subtract: 50 years, 6 months
Result: Calculate what date was 50.5 years before 2025
Example 3: Event Planning
Start: Wedding date
Subtract: 1 year (planning period)
Result: When to start planning for the wedding
📅 Calendar Facts
💡 Calculator Tips
Combine multiple time units in one calculation
Use subtraction to find past dates
Perfect for project planning and deadlines
Automatically handles leap years
Shows day of week for calculated dates
Understanding Calendar Calculations
How Calendar Math Works
Calendar calculations involve adding or subtracting time periods from a given date. The Gregorian calendar system handles varying month lengths, leap years, and different time units automatically for accurate results.
Time Unit Averages
- •Year: 365.25 days (accounting for leap years)
- •Month: 30.44 days (365.25 ÷ 12)
- •Week: 7 days (standard week length)
Common Applications
- •Project deadline calculations
- •Event planning and scheduling
- •Historical date calculations
- •Contract and legal date determinations
- •Age and anniversary calculations
Accuracy: All calculations account for leap years, varying month lengths, and calendar irregularities automatically.