Date Calculator
Answer “how many days between two dates,” build deadlines with add/subtract years-months-days, and read calendar-day totals plus hour and approximate month/year figures. Built for planners comparing contracts, trips, rentals, and SLA windows.
Calculate duration between two dates
Result
Date difference and date arithmetic in one page
Search-style tasks—days between dates, day counter, add days to date—map cleanly to the two tabs.
- Date Difference: Pick start and end on the calendar. Read total calendar days, weeks, rounded months/years-from-days, hours, and the calendar-aware breakdown line.
- Add/Subtract Days: Start from any date, flip Add vs Subtract, mix years, months, and days. Results show the landed-on date and distance from today shown in the summary tiles.
Use Include end date when your rulebook counts both endpoints inside the duration (rent prorations, inclusive promotions). Leave it off for strict midnight-to-midnight gaps.
Calendar math notes
Week counts use seven calendar days per week. Month and year figures derived from day totals are rounded estimates; the breakdown row mirrors calendar months and days between picks.
Local-only picks
Selected dates stay inside your session for this tool’s scripts; nothing posts back for the calculation itself.
Frequently Asked Questions
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