Day Counter
Counts elapsed calendar days between two dates. The start date is not counted as a full elapsed day.
How it works
Days between dates
Formula and assumptions
Elapsed days = end date − start date. This is different from an inclusive count of calendar dates; add one if your use case requires counting both endpoints.
Example
Use the sample values, calculate, and change one input at a time.
Frequently asked questions
Are results exact? Results depend on the assumptions and inputs above.
Can I use this for professional decisions? Verify critical results independently.
Related calculators
Frequently asked questions
Is the start date included in the count?
The output is elapsed days and excludes the start date as a full day; inclusive date counts may be one higher.
What should I check before relying on the result?
Confirm the input units and assumptions described above; independently verify safety-critical, medical, financial or professional decisions.
Does the day counter include the start date?
Date counters can use inclusive or exclusive counting. Check the calculator’s displayed convention before relying on the total.
How do leap years affect date counts?
Leap years add February 29 to the calendar and are handled when the interval crosses that date.