It was a Monday.
December 12, 1949 fell on a Monday.
February 12th 1949 was a Saturday.
Wednesday
Tuesday
Friday
Monday.
12 September 1787 was a Wednesday.
12 September 1947 was a Friday.
12 September 1998 was a Saturday.
September 12 1953 was on a Saturday.
September 12 1988 was a Monday.
September 12 2010 was a Sunday.