Days and nights are different quantities
A hotel stay from Monday to Friday is typically four nights but spans five calendar dates when both endpoints are included. The tool shows both instead of hiding the convention.
Use the same convention as the destination
Visa, tax, insurance, work and residency rules can count days differently. This planner performs date arithmetic only and does not interpret legal presence rules.
Review time-zone edge cases
International departures and arrivals can occur on different local dates. Enter the calendar dates that correspond to the rule or booking you are evaluating.
Use the result for planning, not compliance
For regulated day limits, verify the official counting method and maintain authoritative travel records.