Free Date Difference Calculator Online
Find the difference between any two dates in years, months, days, weeks, and hours.
Key Features
Everything you need in one free tool
See the difference in years and months, total days, total weeks, and total hours all at once.
Instantly swap start and end dates to reverse the calculation direction.
browser-side workflows is done locally in your browser. Your data stays private.
About This Tool
This calculator returns the number of days, weeks, and months between any two calendar dates. It accounts for the different lengths of months and for leap years, so the count is exact rather than an estimate based on an average month length.
Counting days by hand is fiddly once a span crosses several months, and it is easy to be off by one depending on whether you include the start day, the end day, or both. The tool states its convention clearly and gives both the inclusive and exclusive counts so you can pick the one that fits deadlines, notice periods, or billing cycles.
Business and legal contexts often disagree on whether the first day, the last day, or both should count, which shifts a duration by a day. That off-by-one is a common source of billing and deadline errors, so the tool reports the count clearly and lets you apply the convention your situation actually requires.
How to Use It
- Enter the first date and the second date.
- Read the gap in days, and its equivalent in weeks and months.
- Use the inclusive or exclusive count depending on whether both endpoints should be counted.
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