Time & General
Date Plus Days Calculator
Enter start year, month and day plus days to add to see the resulting date.
What date is N days from now?
Deadlines are often “today plus N days.” Enter the start as separate year, month and day number fields, add a whole-day offset, and read the resulting YYYY-MM-DD with weekday so regional text formats never confuse the order. The browser’s Gregorian Date object handles month lengths and leap days automatically when the maths crosses February or year ends. It does not skip weekends or public holidays — for business-day logic you still need a working calendar. Counting backward uses date minus days; age spans use age in days.
Worked example
2026-09-22 + 45 days → 2026-11-06 (weekday shown in the result).
Limits and assumptions
Whole calendar days. Invalid day numbers may roll via the Date constructor — prefer valid calendar dates.
Frequently asked questions
Why year/month/day fields?
Number fields avoid ambiguous text formats like 01/02/03 across regions.
Are weekends skipped?
No — every calendar day counts unless you adjust manually.
Time of day?
Dates are calendar dates at local midnight semantics; hours are ignored.
Leap years?
Yes — 29 February is handled by the standard date maths.