Saturday.
March 21, 1963, was a Thursday.
December 21st 2009 is a Monday.
March 18th 2009 was a Wednesday.
March 3, 2009 fell on a Tuesday.
Sunday.
21st March 1956 was a Wednesday.
March 21st, 2012 fell on a Wednesday.
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.
Friday