INTERACTIVE CALCULATOR
Add or subtract days
Find the date a number of calendar days before or after another date.
UNDERSTAND YOUR NUMBERS
How to read your result
A worked example
Adding 30 days to 1 January 2027 gives 31 January. Entering −7 moves back one week.
How it is calculated
The starting civil date is shifted by a whole number of days. Month ends, year ends and leap years are handled automatically.
Common mistakes and limitations
Calendar days include weekends and holidays. Official deadlines may follow different rules for the start date or non-working days.
Content by Numelva · Methods, sources and limitations ↗