Enter two dates to get the exact number of days between them — an exclusive count, an inclusive count, a weeks breakdown, and a years/months/days breakdown. You can also add or subtract days from any date to find the resulting date. It is built for planning events, deadlines, travel, notice periods and due dates.
How are days between two dates counted?
Pick a start and an end date and press “Calculate”. You get four views of the same gap: exclusive days (the standard difference — e.g. Monday to Friday is 4 days), inclusive days (counting both endpoints — 5 days), a weeks breakdown (e.g. 6 weeks + 3 days), and a years / months / days breakdown using real calendar maths.
The two day counts exist because different situations need different conventions: hotel-style bookings and project timelines usually use the exclusive count, while “how many days is the event including both days?” needs the inclusive one.
What is the difference between inclusive and exclusive day counts?
Exclusive counts the gap between the dates: 1 January to 2 January is 1 day. Inclusive counts both endpoints: the same pair is 2 days. Event planners booking venues usually think inclusively (“a 3-day event runs Friday to Sunday”), while countdowns and notice periods usually think exclusively.
Showing both side by side removes the classic off-by-one confusion that causes so many planning mistakes — pick the convention your situation needs.
How do I add or subtract days from a date?
Use the second calculator: pick a start date, enter a number of days, choose Add or Subtract, and press “Find date”. The result shows the target date with its weekday — for example, 90 days after 1 January 2027 is Thursday, 1 April 2027.
Typical uses: finding a deadline 30/60/90 days out, working backwards from an event date to a booking cutoff (“book the hall 120 days before the wedding”), or computing notice-period end dates.
Event planning use cases
Wedding planners count backwards from the wedding date to set vendor deadlines; HR teams compute probation and notice periods; travellers check trip lengths; students count down to exams. The weekday on the result helps avoid accidentally scheduling key dates on a Sunday when offices are closed.
For age-style questions (“how old is X in years and months?”) use the age calculator; for a single generic difference the date difference calculator covers the same ground.
How do I use this tool?
- Between dates: pick the start and end dates, press Calculate — the order doesn't matter.
- Add/subtract: pick a date, enter days, choose Add or Subtract, press Find date.
Frequently asked questions
Are leap years handled correctly?
Yes. All calculations use the real calendar, so 29 February is counted exactly when it exists. The years/months/days breakdown also respects actual month lengths.
Does it count business days?
It shows a rough weekday estimate (about 5/7 of the days), but not an official business-day count — public holidays differ by country and region, so check your local holiday calendar for exact working-day counts.
Which time zone is used?
Dates are treated as plain calendar dates in your device's local time zone — no hours or time zones are involved, so the day counts are the same everywhere.
What is the maximum date range?
Any dates your browser's date picker supports — effectively centuries in either direction. Very long ranges still compute instantly.
Can I use it for past dates?
Yes. It works for any two dates, past or future — for example, how many days ago an event happened.
Is this calculator free?
Yes — free, unlimited and no sign-up, like every tool on this site.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested