Calculators

Add or subtract from a date

Add or subtract years, months, weeks, days and business days; month-ends are clamped.

1Fill in the values

2Click Run

3See results instantly

Limits

Years and months move first, then weeks and days, then business days.
If the day does not exist in the target month it is clamped to the last day: 31 Jan + 1 month = 28 Feb (29 in a leap year).
Business days are Monday to Friday; public holidays are not excluded. Calendar dates only, so time zones never change the result.

Ask the AI chat

The AI chat can run this tool for you. Try:

“30 days after 2026-10-22”
“add 3 months to 31 Jan 2026”
“subtract 2 weeks from 10 March 2026”