It was a Wednesday
21st December 12012 fall on Friday
December 21st 2009 is a Monday.
Tuesday.
The 21st December 2012 will fall on a Friday.
On Saturday the 21st of June in the northern hemisphere and on Sunday the 21st of December in the southern hemisphere.
July 21st, 1977 fell on a Thursday.
21st January 2004 fall on a Wednesday.
This depends on the year. July 21st has occurred on every day of the week.
August 21st 1996 was a Wednesday.
21st July 2010 is a Wednesday.
It was a Monday.
It was a Saturday.