Date Difference Calculator
Measure the exact gap between two dates in days, weeks, and months — tenures, ages, project spans. A 3-year job stint reads 1,096 days instantly — free, no signup, runs locally.
How to Use the Date Difference Calculator
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Frequently Asked Questions
How many days did I work a 3-year job?
Enter start and end dates: 3 full years including one leap day total 1,096 days. The tool breaks the span into years, months, weeks, and leftover days for resumes and tenure claims.
Does it count months as 30 days?
No — calendar months vary, so the tool counts real month boundaries plus leftover days. 15 January to 15 March is exactly 2 months (59 or 60 days depending on leap year), not 60 flat.
Can I include or exclude the end date?
Check the tool's convention: most counters exclude the end date (15th to 16th = 1 day). For age math this matches legal convention; for hotel nights it matches billing.
Are my dates uploaded anywhere?
No — all math runs locally in your browser. Dates never leave your device.
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Last updated October 2026