Date calculator
Add or Subtract Days.
Find the date N days before or after a given date
Date math depth
How this add or subtract days page differs
Each calculator type uses the same interactive shell, so the page adds type-specific examples, edge cases, and canonical boundaries to avoid becoming a duplicate utility surface.
Best use case
Best when a date rule says 'N days from this date' or 'N days before this date' and month/year boundaries matter.
Worked example
Adding 90 days to November 15 crosses into the next calendar year without manual month math.
Edge cases this page calls out
Subtract mode handles past dates · Leap years are counted from actual calendar dates · The result is a date, not a clock-time duration
Canonical calculation boundary
This route keeps the answer focused on deterministic calendar math. It does not emit schema for user-entered dates and does not claim country-specific public-holiday closures.
Calculations are deterministic calendar math. User-entered dates stay in the browser component and are not turned into crawlable pages or structured data.
Popular countdowns
Public holidays by country
FAQ
Can I subtract days instead of adding?▾
Yes. Toggle the direction to 'Subtract' to find a date in the past.
Does it handle month and year boundaries?▾
Yes. Adding 90 days to November 15 correctly crosses into the next year.