Date & Time
Date Difference Calculator
Count the elapsed days between two dates and choose whether to include either endpoint in the inclusive count.
How to use
Select a start date, end date, and endpoint rule. The elapsed difference is shown separately from the selected inclusive day count.
Formula
Elapsed days = end date − start date · Inclusive count = dates between the endpoints plus the selected endpoints
Example
How many days are between January 1 and January 3?
The elapsed difference is 2 days; including both dates gives 3 days.
Frequently asked questions
- Are the start and end dates included by default?
- Elapsed days exclude endpoint counting. A separate result applies the endpoint option you select.
- Can the end date be earlier than the start date?
- No. Choose an end date on or after the start date.