METHOD
Formula and method
Adds the chosen number of days in the Gregorian calendar.
Add days to a date or subtract them
Move a date by a positive or negative number of calendar days.
01
Your inputs
Starting values are an example. Replace them with your own.
Your inputs stay in your browser.
02
Your result
Enter your details and run the calculation.
About this result
Informational calculations. Check assumptions, dates and jurisdiction before making a decision.
Full disclaimerWhat date is 30 days after a given date?
The calculator moves a chosen date by a set number of calendar days in the Gregorian calendar, so it accounts for different month lengths and leap years. A positive number adds days and a negative number subtracts them. For example, 13 October 2026 plus 30 days gives 12 November 2026, which helps with deadlines, notice periods and document expiry dates.
TRACEABLE
Sources and validity
Basic arithmetic or geometry using the formula shown. Uses only your inputs.
How we maintain data