Date Difference Calculator
Count the days, weeks, months and years between two dates.
Results
How to use
Enter any two dates. The tool shows the exact number of days between them, the same span in weeks, in months and days, and in years, months and days. Use the checkboxes to control whether the endpoints count, or to count only weekdays.
Examples
- 2026-01-01 → 2026-12-31 is 364 days (365 when the end date is included).
- 2024-02-28 → 2024-03-01 is 2 days, because 2024 is a leap year and February 29 exists.
- 2026-07-31 → 2026-09-01 is “1 month 1 day”, anchored at the end of August.
Frequently asked questions
Is the end date counted?
By default the calculator counts the nights between the two dates (end minus start), which matches how most people count “days until”. Tick “include end date” to count both endpoints — useful for durations like rental periods or medication courses.
How are leap years handled?
The day count is exact: February 29 is a real day and is included whenever the range crosses it. The year/month breakdown uses calendar months, so “1 year” from March 1, 2023 to March 1, 2024 is correct even though that span is 366 days.
Why does the months-and-days result look asymmetric?
Months have different lengths, so month arithmetic anchors on the day of month. From January 31 to March 1 is “1 month 1 day” because January 31 → February 28/29 counts as one month, then one more day reaches March 1.
Do time zones affect the result?
No. This tool works with pure calendar dates and never converts them through a time zone, so a date you type can never shift to the previous or next day.