2024-02-28 to 2024-03-06
7 elapsed days (1 full week) and 8 inclusive calendar days. This leap-year range includes February 29.
Weeks Between Dates Calculator
Calculate elapsed and inclusive days, exact weeks, full seven-day periods, and the ISO calendar weeks touched by two dates.
Direct answer
14 elapsed days: 2 full weeks
Counting both the start and end dates gives 15 inclusive calendar days, with 3 ISO calendar weeks touched, including any partial Monday-to-Sunday weeks at either end.
- Start date
- 2026-08-11
- End date
- 2026-08-25
- Elapsed days
- 14 days
- Full weeks
- 2 weeks
- Exact weeks
- 2 weeks
- Partial seven-day periods
- 2 partial weeks
- Inclusive calendar days
- 15 days
- ISO calendar weeks touched
- 3 weeks
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Copy the result or a shareable URL that keeps this start and end date.
How weeks between dates are counted
- Elapsed days
- End date minus start date. The start date is day 0, so May 3 to May 18 is 15 elapsed days.
- Inclusive calendar days
- Elapsed days plus 1. Use this when both the start and end dates should count.
- Full and partial periods
- A full week is 7 elapsed days. Partial seven-day periods round the duration up; they are not named calendar week numbers.
- ISO calendar weeks touched
- This counts distinct Monday-to-Sunday ISO weeks containing at least one selected date, including partial weeks at the boundaries.
This is a calendar-duration calculation. It does not count business days or exclude holidays.
Worked weeks-between examples
2025-12-29 to 2026-01-12
14 elapsed days (2 full weeks) and 15 inclusive calendar days. Crossing New Year does not change the duration formula.
FAQ
What is the difference between elapsed and inclusive days?
Elapsed days use end date minus start date, so the start is day 0. Inclusive days count both boundary dates and equal elapsed days plus 1.
What does a partial week mean here?
A partial seven-day period is the elapsed duration rounded up to the next week. The separate ISO calendar weeks touched result counts distinct Monday-to-Sunday weeks instead.
Does this calculator count business days or holidays?
No. It measures calendar duration only. Weekends and holidays are included like any other calendar day.
Does crossing a year or leap day change the calculation?
No. Valid calendar dates are compared directly, so New Year boundaries and February 29 are included automatically.