Under the original timetable set by the German Presidency of the Council of the European Union in the first half of 2007, the Treaty was initially scheduled to be fully ratified by the end of 2008, thus entering into force on 1 January 2009. This plan failed however, primarily due to the initial rejection of the Treaty in 2008 by the Irish electorate in a referendum, a decision which was reversed in a second referendum in October 2009. Ireland, as required by its constitution, was the only member state to hold referendums on the Treaty.