Count the exact days between two dates — with the result also shown in weeks, in months-and-days, and as working days (Mon–Fri). Then flip the mode to answer the other everyday question: what date is 90 days from today? Deadlines, visa windows, notice periods, project timelines and countdowns, all handled live.
How to use it
- Pick your two dates — the difference appears instantly in days, weeks, months and working days.
- Need a future or past date instead? Switch to Add / subtract days.
- Dates in the wrong order? No problem — the tool shows the positive difference and says so.
Frequently asked questions
How are days between dates counted?
As full calendar days between the two midnights. Monday to Friday of the same week is 4 days — if your context counts both endpoints (like hotel nights vs stay days), add 1.
Can it count working days?
Yes — the result includes a Monday-to-Friday working day count automatically. Public holidays vary by country, so subtract yours from that figure.
Can I find the date 90 days from today?
Yes — switch to Add / subtract days, keep today as the start date, enter 90, and you get the exact date and weekday. Perfect for deadlines, visas and notice periods.
Does it handle leap years?
Yes — all date maths uses the real calendar, leap days included.
Date-adjacent tools: the age calculator for exact ages and the percentage calculator — more in our free daily tools.
The off-by-one problem
Ask how many days there are between 1 March and 3 March and you can defensibly answer 2 or 3. Both are right — they answer different questions.
Two counts the gaps between the dates: the elapsed duration. Three counts the days themselves, including both endpoints. Duration calculations use the first; anything where each day is a unit — hotel nights versus days, hire periods, notice served — may need the second.
When a deadline matters, establish which definition the rule uses before you count. Contracts and court rules are usually explicit about whether the first day is included.
Working days are not just weekdays
Excluding Saturdays and Sundays is easy. Public holidays are the part that catches people, because they differ by country and often by region within one — Scotland and England do not share the same bank holidays, and neither matches the US.
If a deadline is expressed in working days and lands near a holiday period, check the specific calendar for the jurisdiction that matters. A five-working-day turnaround over Christmas can be a fortnight.
Leap years and the rule most people misremember
A year is a leap year if divisible by 4 — except centuries, which must be divisible by 400. So 1900 was not a leap year and 2000 was. The next century exception is 2100.
This is a real source of bugs in software and spreadsheets, and it is why any tool doing date arithmetic should be doing it with a proper date library rather than multiplying by 365.
Months are not a fixed length
“Three months from 30 November” has no obvious answer, because 30 February does not exist. Different systems resolve it differently — some to 28 February, some to 2 March.
For anything contractual, count in days rather than months. It removes the ambiguity entirely and is what most legal drafting does for exactly this reason.
Calculated in your browser
Dates are handled on your device with no transmission. For age specifically the age calculator handles the years-months-days breakdown, and the unit converter covers other measurement conversions.