How it works
Add an integer number of UTC calendar days
Input definitions
- Start date
- A complete Gregorian calendar date.
- Days to add (negative subtracts)
- Enter the value in the labeled unit.
A worked example
- Start date
- 2024-02-28
- Days to add (negative subtracts)
- 2
Assumptions & limits
Gregorian calendar dates at UTC midnight. Calendar-day arithmetic, not local elapsed hours. No holidays. End date excluded unless an inclusive option is selected.
Sources & review
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Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Do daylight-saving changes affect calendar date results?
Date-only operations compare Gregorian calendar dates at UTC midnight. They do not count local elapsed hours. Timestamp operations require an explicit offset; individual tool assumptions state boundary rules.
How does the Add or subtract days tool work?
Add an integer number of UTC calendar days.
What are the assumptions and limits of Add or subtract days?
Gregorian calendar dates at UTC midnight. Calendar-day arithmetic, not local elapsed hours. No holidays. End date excluded unless an inclusive option is selected.