Two Tools in One
Days between dates counts the exact calendar days from one date to another — for project timelines, ticket refund windows, visa stays, or "how long until vacation". Add/subtract days answers questions like "what date is 90 days from today?" — the classic deadline calculation.
Worked Examples
- January 1 to July 11, 2026 → 191 days (about 27.3 weeks or 6.3 months).
- 90 days after July 11, 2026 → Friday, October 9, 2026 — including the weekday, since deadlines landing on weekends often shift.
Inclusive or Exclusive Counting?
This calculator counts the difference between dates — July 1 to July 3 is 2 days. Some legal deadlines count inclusively ("within 14 days of receipt" may include the receipt day); when a contract or authority sets the deadline, read their counting rule and add a safety margin.
Months and Years Are Averages
The weeks value is exact (days ÷ 7); months and years shown use average lengths (30.44 days, 365.25 days) because calendar months differ. For anniversaries, the add/subtract mode with real calendar dates is more precise.