If you're asking about the 2008 Olympics specifically, http://www.olympic.org/uk/games/beijing/index_uk.asp says "BEIJING 2008 Games of the XXIX Olympiad From the 8th August to 24th August 2008". So, presumably 24th August 2008 is the last day.
February 28, 2010
Febuary 28
The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.The opening ceremony is on the 27th of July and the Olympics finish on the 12th of August.
27 july - 12 august
the Olympics finish on august the 12th 2012.
Aug122012
last
12 August
August 12
August 12
393 a.D
August 12