Date Difference Calculator
/date-differenceFind the exact difference between two dates in days, weeks, months, and years — with a calendar picker.
Project timelines and lease dates need exact day counts between two dates. This calculator returns the difference in days, weeks, months, and years at once, with a calendar picker for both dates. It is reliable for deadlines and billing periods. Calculation runs instantly in your browser.
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FAQ
Frequently asked questions
Everything you need to know about date difference calculator.
Which units does the result include?
You get a years, months, and days breakdown plus total days, weeks, hours, minutes, and seconds. The headline summary is copyable with one click for use in documents.
What if the end date comes before the start date?
The tool automatically swaps the two dates, shows a note explaining the direction, and computes the difference as a positive value instead of an error.
Is the first day included in the count?
The tool uses exact calendar differences, so consecutive dates (Jan 1 to Jan 2) count as 1 day, and month lengths and leap years are respected in the breakdown.
Can I use this for age calculations?
Yes. Set a birth date as the start date and today as the end date to get the full breakdown of years, months, days, and total hours or minutes.
Does it work offline?
Yes. The calculator is a static browser component: no network calls, no uploads, and no account. Pick any two dates and the difference appears instantly.
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