Date & time Difference

Days between dates

From

Counting

Days —

The same gap in other units

Weeks —

Whole weeks —

Months —

Years —

Years, months, days —

Hours —

Minutes —

Note Enter both dates

Inclusive counting adds one day

Gaps worth knowing

Span	Days	Weeks
One week	7	1
One fortnight	14	2
Four weeks	28	4
One common year	365	52.14
One leap year	366	52.29
Two years	730 or 731	104.3
One decade	3,652 or 3,653	521.7

The days between two dates is the plain difference — 1 January to 31 January is 30 days. Counting both end days instead gives 31. Which you want depends entirely on the question, which is why this tool offers both.

How to count days between dates

1 Enter both dates. Order does not matter — the gap is the same either way.

2 Choose whether to count between the dates or to include both days.

3 Read the days, with weeks and the calendar breakdown underneath.

4 The direction row tells you whether the second date is before or after the first.

Inclusive counting is the single most common source of off-by-one disputes. "How many days is my holiday" counts both the first and last day, so a Monday-to-Friday break is five days. "How many days until Friday" counts the gap, so from Monday it is four. Contracts, notice periods and hire agreements each pick one convention and rarely say which — when it matters, the safe move is to state the two dates rather than the count.

Questions

How many days between two dates? −

Subtract one from the other. 1 January to 31 January is 30 days between, or 31 counting both days.

Should I count both end days? +

Does a leap year change the answer? +

Does the order of the dates matter? +

How many days in a year? +

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