What day of the week was December 31, 2004?

The day of the week December 31st, 2004 fell on was a Friday.

Gérard Debreu the French economist and mathematician, Nobel Prize laureate (b. 1921) died on this day in 2004.

The official opening of Taipei 101 the the tallest skyscraper at that time in the world, standing at a height of .