2004 instance of calendar year
2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar, the 2004th year of the Common Era (CE) and Anno Domini (AD) designations, the 4th  year of the 3rd millennium and the 21st century, and the  5th   year of the 2000s decade.  
2004 was designated as an International Year of Rice by the United Nations, and the International Year to Commemorate the Struggle Against Slavery and its Abolition (by UNESCO).May
May 1 – The European Union expands by 10 new member states: Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia.
May 9 – A stadium bombing in Grozny, Chechenya, Russia kills ten people, including regional governor Akhmad Kadyrov.
May 12–15 – The Eurovision Song Contest 2004 takes place in Istanbul, Turkey, and is won by Ukrainian entrant Ruslana with the song "Wild Dances".June
June 1 – A United Nations peacekeeping mission in Haiti begins, the United Nations Stabilisation Mission in Haiti (MINUSTAH).
June 8 – 2004 transit of Venus.
June 12–July 4 – Portugal hosts the UEFA Euro 2004 football tournament, which is won by Greece.
June 21 – In Mojave, California, United States, SpaceShipOne becomes the first privately funded spaceplane to achieve spaceflight.
June 28 – The U.S.-led coalition occupying Iraq, the Coalition Provisional Authority (CPA), transfers sovereignty to the Iraqi Interim Government.
June 30 – Preliminary hearings begin in Iraq in the trial of president Saddam Hussein, for war crimes and crimes against humanity.
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