# Calculate Duration Between Two Dates
- This calculator helps you find the difference between two dates.
- We call the first date the "Start Date" and the second one the "End Date."
- You can enter a past date as the "Start Date" to see how many days have passed since then.
- Alternatively, enter a future date as the "End Date" to see how many days are left until then. Of course, you can also enter any two dates you like to find the difference between them.
- The result is shown in calendar days, based on the length of the difference. You can also choose to exclude the last day by checking the "Except End Day (minus 1 day)" option.