Public holidays in Tanzania are in accordance with the Public Holidays Act, amended among others in December 1964, August 1966, July 2022, and are observed throughout the nation.
The President of Tanzania may declare additional holidays at his or her discretion, as stated in article 3 of the Public Holidays Act, for example, during the general election day. A recent example of this was on 4 November 2015 where President Kikwete announced a national holiday for the next day to celebrate Magufuli winning the presidential election.
Karume day, Saba saba day and Nyerere day do not appear in the Public Holidays Act, and are declared by the President. This happens however traditionally every year.