Days Between Dates Calculator
Calculate the exact number of days, weeks, months, and years between any two dates. Also shows the day of the week for both dates and whether the end date is in the past or future.
How to calculate days between dates
Select a Start Date and an End Date using the date pickers. The tool instantly calculates the difference using pure JavaScript Date arithmetic — no server requests, no libraries.
By default the end date itself is not counted — so the difference between 1 January and 2 January is 1 day. Toggle Include end date to add one more day to the count (useful for inclusive ranges, such as booking nights at a hotel).
Use Swap dates to flip start and end without retyping. The tool shows whether the end date is in the future, in the past, or the same day as the start.
Weeks + remaining days break the total down further. Months and Years are approximate figures (based on 30.44 days/month and 365.25 days/year) — for exact calendar months use a specialised age calculator.
Common use cases
- Project deadlines — count down the days until a launch or milestone date.
- Anniversaries & countdowns — see how many days until (or since) a special event.
- Age of a document or contract — find out how long something has been active.
- Travel planning — calculate the length of a trip between departure and return dates.
- Billing periods — verify the exact number of days in a billing or subscription interval.
- Historical research — measure the span between two historical dates precisely.
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