Wednesday.
Monday
Sunday
It was a Monday.
May 15, 2006 was a Monday.
15 April 2006 was a Saturday.
15 January 2006 was a Sunday.
February 15 2006 was a Wednesday.
15th December 1963 was a Sunday.
June 15, 2006, was a Thursday.
November 15, 2006 fell on a Wednesday.
September 15, 2006 fell on a Friday.