TopToolsAiCalculate the exact number of days, weeks and months between any two dates — useful for deadlines, countdowns, contracts and age-related planning. Between 1 January 2026 and 17 September 2026, for example, there are 259 days, which works out to roughly 37 weeks — the tool counts inclusively or exclusively depending on whether you want to include the start date.
Last updated: 1 Sep 2026
How to use Days Between Dates Calculator
- Pick the start date.
- Pick the end date.
- Click "Calculate" to see the exact number of days, weeks and months between the two dates.
Frequently asked questions
Does it count the start and end date both?
It counts the number of full days between the two dates. If you need an inclusive count (both dates counted), add 1 to the result.
Can I use it for future dates?
Yes — pick any two dates, past or future, and it calculates the absolute difference between them.
Does it account for leap years?
Yes — since it works from real calendar dates, leap years are factored in automatically without any extra input needed.
Can I get the result in weeks or months instead of days?
The result is shown in total days, which you can divide by 7 for weeks; for calendar months/years breakdown, the Age Calculator format may be more useful.
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