Time & Date
Days Between Dates Calculator
Use this calculator to count elapsed days between deadlines, trips, assignments, projects, and events.
Try an example
Result
Days
—
- Weeks
- —
Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the days between dates calculator solves
Use this calculator to count elapsed days between deadlines, trips, assignments, projects, and events.
Formula
How to use it
- Enter the start date.
- Enter the end date.
- Choose elapsed or inclusive counting.
How to read the answer
Elapsed days counts how much time passes. Inclusive days counts calendar dates touched.
Common mistakes and edge cases
- Inclusive counting is common for event spans but not elapsed time.
- Time of day is ignored.
- Date order affects the sign.
Worked examples
Elapsed days
Days
24
Inclusive event span
Days
3
Frequently asked questions
Should I use inclusive counting?+
Use inclusive when counting dates on a calendar, such as a trip from Friday through Sunday.
Does it include time of day?+
No. It counts whole calendar days from midnight to midnight.
About this calculator
- Written by
- mathcheck editorial team
- Last reviewed
- May 8, 2026
Method
- Uses the values entered by the user and stable formulas documented on the page.
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Last updated: May 8, 2026