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.

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.

Start date

Operation

Amount

Unit

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.

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