Days Between Dates
Counts the days between two dates — 173 days, say — along with the week breakdown and the inclusive count that adds one for counting both endpoints. Pick two dates and the arithmetic is done for you, leap years and month lengths included.
How to use
- Set the start date.
- Set the end date — it defaults to today.
- Read the day count, the weeks-and-days breakdown, and the both-ends-inclusive figure.
- Use the inclusive figure when the first day itself counts, as in rental periods and medication courses.
When you actually need this
- Counting days between contract signing and a deadline.
- Working out how many days a trip, project phase or notice period spans.
- Calculating an interest period or per-day cost from two statement dates.
- Checking days since an event — a purchase, a filing, an anniversary.
The off-by-one that catches everyone
From the 1st to the 5th is four days of difference but five calendar days if both ends count — and which one is right depends entirely on context. Interest, age and durations use the difference; rental days, prescription days and event days usually count inclusively. Deadlines phrased as "within 14 days" differ by jurisdiction and contract on whether day zero counts, so read the wording rather than assuming. This tool shows both figures so the choice is at least a conscious one.
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FAQ
Which time zone does Days Between Dates use?
It uses your device's local time zone and calendar settings, so the result matches the dates you see elsewhere on your computer or phone. Nothing is converted to UTC behind the scenes.
Does Days Between Dates handle leap years correctly?
Yes. The calculation works on real calendar dates rather than a fixed 365-day year, so February 29th, month lengths and century leap-year rules are all applied correctly.
Is the start or end day included in the count?
The tool shows the elapsed days between the two dates. If you need an inclusive count — for example counting today as day one of a challenge — add one to the result.