Calendar math, not 30/365
Months and years are counted on the real calendar — so February 1 to March 1 is one month even though it's only 28 or 29 days. That matches how contracts, leases, and anniversaries read.
EverydayCalculator
Date Difference Calculator
Count the exact days, weeks, months, and years between any two dates.
What it means
About this calculator.
Business days caveat
The business-day output is a quick weekday estimate (total ÷ 7 × 5). It doesn't subtract federal holidays or your local observances. For an exact workday count, subtract those manually.
FAQ
Questions people usually have.
Can the from-date be after the to-date?
Yes — you'll see negative values. We don't auto-swap so the direction is explicit.
Does this work for dates before 1900?
Yes, browsers support dates back to 0001 in the date picker. JavaScript date math is reliable inside this range.
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