📅How many days between two dates?

Try one of these too

Ask two people how many days there are between 1 June and 5 June and you will get two answers, each defended with total confidence. The disagreement is not about arithmetic. One person is counting the spaces between the dates and the other is counting the dates, and every off-by-one argument about deadlines, hotel bills, visa stays and notice periods is a version of that same split.

Two counts, one calendar

The right-hand column is always exactly one higher, which is the whole of the problem. There is no third possibility and no ambiguity once you know which column you are in — the trouble is that calculators, contracts and booking systems rarely say.

Which count does your situation want?

Nights, hire and interest: the gaps. Anything billed per night or accruing per day is charging for the intervals, so a Friday-to-Sunday stay is two nights. This is the default here.

Stays, sentences and attendance: the dated days. If the question is “how many days were you present”, every date you touched counts, including the day you arrived and the day you left. Switch the end day on.

Court and administrative deadlines: usually neither, quite. The common rule excludes the day of the triggering event and includes the last day, then rolls the last day forward if it lands on a weekend or a holiday. That is the gap count with a rollover on the end, and it is worth reading the rule that governs your case rather than assuming.

Payroll and notice periods: read the contract. A month’s notice and thirty days’ notice are the same length in only four months of the year — the ones that have thirty days in them — and whether the notice day itself counts is a term of the agreement, not a property of the calendar.

What comes with the number

The headline is the span in days; the lines under it are the questions people ask about thirty seconds later.

Whole weeks and leftover days turns a figure like 100 into something you can picture on a wall planner. If you would rather have that as the headline, the weeks between dates calculator leads with it.

Months and days is walked out of the real calendar rather than divided by an average month, so it never claims a span is 1.97 months.

Working days and weekend days splits the span the way a project plan does. It counts Monday to Friday only; for a count that also drops public holidays, use the business days calculator.

Hours and decimal weeks are there for spreadsheets, timesheets and anything that wants a number rather than a phrase. For a span that includes times of day rather than whole dates, the time duration calculator goes down to the minute.

If you would rather start from one date and a length of time — thirty days from now, six weeks before the deadline — that is the days from today calculator, and if the far end of the span is somebody’s birthday, age in days counts it in the units people actually celebrate.