Add / Subtract Days: instructions, examples and limits
Adds a signed whole number of calendar days, rolling across month and year boundaries.
Open Add / Subtract DaysThis tool is registered for local processing. Its tool input is handled in the current page; LittleKit’s product analytics do not include the input value.
What it does
Adds a signed whole number of calendar days, rolling across month and year boundaries.
Worked example
2024-02-28 + 1 day → 2024-02-29.
The example demonstrates the operation. For file-based tools, results depend on the selected file and options.How the result is produced
Adds a signed whole number of calendar days, rolling across month and year boundaries.
Important limits
Date-only calculations use the Gregorian calendar and UTC day boundaries, so daylight-saving changes do not alter day counts. Years 0001–9999.
Choosing the next step
Use a calendar-date tool when the question is about dates on a page, and a duration tool when elapsed clock time matters. For a deadline across time zones, convert the times explicitly before relying on a local-device result.
See a mismatch between these instructions and the tool? Report a correction with a non-sensitive example.