Date Difference Calculator
Runs locallyCalculate the exact difference between two dates in days, weeks, months and years — plus business days.
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Pick two dates and see the exact gap expressed in days, weeks, months and years, including a business-day count that skips weekends. The end date can be included or excluded. Everything runs in your browser.
Frequently asked questions
What units is the difference shown in?
Days, weeks, months and years — plus a business-day count that skips weekends. You can choose whether the end date itself is included.
Are leap years counted correctly?
Yes. The calculation uses real calendar arithmetic, so February 29 and varying month lengths come out right.
Does it run locally?
Yes — date math happens entirely in your browser.