Date to Date Calculator
Calculate the exact time difference between two dates with precision and multiple format options
Calculate Days Between Dates
Select the beginning date of the period
Select the ending date of the period
Check this box to include the end date as part of the count
Quick Examples
Example Calculation
Project Timeline Example
Project Start: January 1, 2024
Project End: March 31, 2024
Include End Date: Yes
Results
Duration: 3 months and 1 day
Total Days: 91 days
Business Days: 65 days
Weekend Days: 26 days
Common Use Cases
Project Planning
Calculate project duration and deadlines
Employment
Calculate work experience duration
Events
Count days until special occasions
Finance
Calculate investment periods and interest
Calendar Tips
Include end date for inclusive counting
Business days exclude weekends only
Results account for leap years automatically
All calculations use the Gregorian calendar
Understanding Date Calculations
How Date Counting Works
Date counting calculates the exact time difference between two dates. The calculation considers years, months, and days, accounting for varying month lengths and leap years automatically.
Include vs Exclude End Date
- •Include: Both start and end dates are counted
- •Exclude: Only the start date is counted
- •Business days exclude weekends (Saturday & Sunday)
Calendar History
Our calculator uses the Gregorian calendar, adopted in 1582. This calendar corrected the Julian calendar's drift by removing 10 days and establishing the leap year rules we use today.
Leap Year Rules
- • Divisible by 4: Usually a leap year
- • Divisible by 100: Not a leap year
- • Divisible by 400: Is a leap year
- • Example: 2000 was a leap year, 1900 was not