<P> The Brussels European Council of December 17, 2004 confirmed the conclusion of accession negotiations with Bulgaria and Romania . The 26 September 2006 of the European Commission confirmed the date once more, also announcing that Bulgaria and Romania would meet no direct restrictions, but progress in certain areas--reforms of the judicial system, elimination of corruption and the struggle against organized crime--would be strictly monitored . </P> <P> With this accession, Cyrillic became the third official alphabet of the EU, after the Latin and Greek alphabets . Cyrillic will also be featured on the euro banknotes and the national (obverse) side of the Bulgarian euro coins . The ECB and the EU Commission insisted that Bulgaria change the official name of the currency from ЕВРО (EVRO) (as accepted) to ЕУРО (EURO), claiming that the currency should have a standard spelling and pronunciation across the EU . For details, see Linguistic issues concerning the euro . The issue was decisively resolved in favour of Bulgaria at the 2007 EU Summit in Lisbon, allowing Bulgaria to use the Cyrillic spelling евро on all official EU documents . </P> <P> The date of accession, 1 January 2007, was set at the Thessaloniki Summit in 2003 and confirmed in Brussels on 18 June 2004 . Bulgaria, Romania and the EU - 25 signed the Treaty of Accession on 25 April 2005 at Luxembourg's Neumuenster Abbey . </P> <P> The 26 September 2006 monitoring report of the European Commission confirmed the entry date as 1 January 2007 . The last instrument of ratification of the Treaty of Accession was deposited with the Italian government on 20 December 2006 thereby ensuring it came into force on 1 January 2007 . </P>

When did romania become part of the eu