14 tools
Date difference & duration
How far apart two instants are — in whichever unit you need, counting every day or only the working ones. Each tool has its own page. It runs in your browser, and it keeps its inputs in the address bar so you can share the answer.
The tools
Work out how far apart two dates or times are, in days, weeks, months, hours or seconds. Count every day, only the working days, or just the weekends.
Date Difference CalculatorThe difference, the duration, the interval — the same question under three names. Enter two dates and get the gap in every unit at once: years, months and days as a person would say it, and the exact totals underneath.
Time Difference CalculatorTwo clock times or two full timestamps, and the difference in hours, minutes and seconds — including the overnight case, where the end time is smaller than the start.
Days Between DatesA plain day count, with the weekday split beside it and the inclusive answer stated too — because half the time "days between" means one more than subtraction gives.
Weeks Between DatesWhole weeks and the days left over, plus the exact decimal — a week is the one calendar unit with a fixed length, so this answer is never approximate.
Months Between DatesWhole calendar months and the days left over — worked out by walking the calendar, so the answer matches what a lease, a loan schedule or a notice period means by "a month".
Years Between DatesWhole years, then the months and days on top — the same rule an age is worked out by, so an anniversary counts on the day and not the day before.
Hours Between DatesThe exact hour count between two instants, including the fraction — and a warning when a daylight-saving change means the answer is not what dividing by 24 would suggest.
Minutes Between DatesAn exact minute count between two instants, with the seconds remainder and the totals in every other unit.
Seconds Between DatesThe count that Unix time itself is measured in — an exact second difference between two instants, with the millisecond, microsecond and nanosecond totals beside it.
Business Days CalculatorNon-working days out, your own public holidays out, and every removed day listed — so you can see exactly what the count is made of rather than trusting a number.
Weekend Days CalculatorSaturdays and Sundays counted separately, plus every other weekday, so you can see exactly how a span is made up rather than just how long it is.
Holiday Difference CalculatorPaste your holiday dates and see which fall inside the span, how many working days they actually cost, and which land on a day you were not working anyway.
Inclusive Date DifferenceThe count that includes the first day and the last — what a hotel bill, a jury summons, a sick note or a "within 30 days" clause almost always means.
Elapsed Time CalculatorPick a moment and watch the time since it climb, second by second. The page keeps ticking, so it works as a running clock on anything you have started.