Add or Subtract Days from a Date

Common use cases

• Project deadlines — "kickoff + 90 days" or "launch − 14 days" for content prep
• Shipping estimates — order date + N business days for delivery quote
• Trial periods — signup date + 14 days for trial expiry
• Contracts — start + 12 months for renewal date
• Personal — birthday + X days, "in 100 days I'll have …" challenges

Edge cases handled

• Short-month overflow — Jan 31 + 1 month = Feb 28/29 (not Mar 3)
• Leap years — adding 1 year to Feb 29 → Feb 28
• Business days — Saturdays and Sundays are skipped, but holidays are not (use the working-days tool for that)

Privacy

Date math runs in your browser. Nothing is uploaded.