Days between Dates Calculator
Calculate the exact number of days between any two dates with precision
Calculate Days Between Dates
When checked, the end date will be counted as an additional day
Time Difference Results
Please select both start and end dates to calculate the difference
Example Calculation
Age Calculation Example
Birth Date: September 5, 1970
Current Date: June 5, 2022
Method: End date - Start date
Result: 18,901 days (not including end date)
With end date: 18,902 days
Project Duration Example
Start: July 4, 2024
End: July 26, 2024
Calculation: 26 - 4 = 22 days
Including end date: 22 + 1 = 23 days
Common Use Cases
Age Calculation
Calculate your exact age in days
Project Duration
Calculate project timelines
Event Planning
Days until special events
Historical Events
Time since historical dates
Calculation Tips
Use the "Include end date" option for counting inclusive periods
Results can be negative if the end date is before the start date
The calculator accounts for leap years automatically
Quick buttons set common date ranges instantly
Understanding Date Calculations
How the Calculator Works
This calculator determines the exact number of days between two dates by subtracting the start date from the end date. The calculation accounts for varying month lengths, leap years, and provides results in multiple time units.
Include End Date Option
- •Unchecked: Exclusive counting (end date not included)
- •Checked: Inclusive counting (end date included)
- •Example: July 4 to July 6 = 2 days (exclusive) or 3 days (inclusive)
Manual Calculation Method
Step 1: Calculate complete years
Step 2: Calculate remaining months
Step 3: Calculate remaining days
Step 4: Convert all to days and sum
Leap Year Consideration: The calculator uses 365.25 days per year on average to account for leap years in long-term calculations.