Dates & time
Date add / subtract
From a date, add or subtract a number of days, weeks, months, years or business days. The tool shows the resulting date and weekday.
Result date
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How to use this tool
Useful for contract deadlines ("delivery in 30 days"), shipping dates ("D+5 business"), subscription renewals ("+1 year"), planning. Business-day mode skips weekends automatically.
Concrete examples
- Today + 30 days
- 2026-04-21 + 1 month = 2026-05-21
- Friday + 3 business days = next Wednesday
Frequently asked questions
- How does "+1 month" work when the day doesn't exist?
- JavaScript auto-rolls over: Jan 31 + 1 month gives Mar 2 or 3 (not Feb 31). For exact control, prefer "+30 days".
- Are holidays considered for business days?
- No. Only Saturdays and Sundays are skipped. Holidays depend on the country and aren't handled automatically.