Article 2 of the Unification Treaty fixes 3 October as the statutory national holiday. The Saturday date in 2026 does not produce a substitute Monday.
3 October applies in every German state. In 2026 it falls on Saturday and is not moved to Monday, so a standard five-day schedule gains no additional weekday off.
Its practical effect depends more on place: unity celebrations, museums, remembrance sites, security areas and public transport publish their own programmes and notices.