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Add days to a date calculator
Add or subtract days from a date: find the date 30, 60 or 90 days from today, or any number of days before or after a start date.
Deadlines are written in days — reply within 30 days, valid for 90 days, a 45-day notice period — but calendars are written in months of different lengths. Give it a start date and a number of days and it returns the exact date and weekday, crossing month ends and leap years correctly. Type a negative number to count backwards.
How Add days to a date calculator works
- Enter or paste your text or values.
- It's processed instantly on your device as you type.
- Copy or download the result.
Good to know: The start date is day zero: 30 days from 1 March is 31 March. That matches how most 'within N days of' deadlines are counted, but check your document — a few rules count the first day too, which moves the answer one day earlier.
Common questions
Does it count weekends and holidays?
Yes. It adds calendar days, which is what 'days' means unless a rule says 'working days' or 'business days'. If yours does, this answer is too early; count working days separately.