Monday
December 5, 1977 was a Monday.
August 5 1977 was a Friday.
Labor Day was Monday, September 5 in 1977. It is always the first Monday of September. That was set by law and does not change.
Saturday.
Sunday
5 September 1938 was a Monday.
5 September 1947 was a Friday.
5 September 1986 was a Friday.
September 5 2010 was a Sunday.
September 5 1962 was a Wednesday.
September 5, 1997 was a Friday.
September 5 1984 was a Wednesday.