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Free Date Difference Calculator
Free Date Difference Calculator is a free online tool by US AI. How many days between two dates? Pick any start and end date — get the exact difference in days, weeks, and a years/months/days breakdown, plus business-day counts. No signup, works on mobile and desktop.
📖 How to use
- Pick a start date and an end date using the date pickers.
- Optionally check business-days only or include-end-date, then press Calculate Difference.
- Copy the summary for your records. Everything runs in your browser — nothing is uploaded.
✨ Why use this tool?
US AI's free date difference calculator uses DST-safe UTC math for exact results. It is fast, private and 100% free forever. Perfect for project planning, tenure tracking and age-in-days calculations.