Monday.
19 October 1977 was a Wednesday.
Jan 19 1977 was on a Wednesday.
August 19 1977 was on a Friday.
19 September 2008 was a Friday.
19 September 1947 was a Friday.
September 19 1985 was a Thursday.
September 19 1987 was a Saturday.
September 19, 1863 was a Saturday.
September 19 2010 was a Sunday.
19 September 1966 was a Monday.
September 19, 1963 fell on a Thursday.
September 19, 1687 fell on a Monday.