May 15, 1961 fell on a Monday.
Saturday
It was a Thursday.
15th December 1961 was a Friday.
15 September 1951 was a Saturday.
September 15 1983 was a Thursday.
September 15 1986 was a Monday.
September 15 1997 was on a Monday.
September 15, 2008 was a Monday.
September 15, 2002 was a Sunday.
September 15, 2000 was on a Friday.
15 September 1996 was a Sunday.