Friday
February 26, 1983 was the 7th day in the 9th week of 1983
October 9 1983 was on a Sunday.
February 9th, 1983 was a Wednesday.
9th September 1960 fell on a Friday.
September 15 1983 was a Thursday.
September 17, 1983 was a Saturday.
September 1, 1983 was a Thursday.
September 27th 1983 was a Tuesday.
It was a Sunday.
It depends which date format you mean... However, in this example, both 5th September 1983, and May 9th 1983 fell on a Monday
September 5, 1983 fell on a Monday.
September 30, 1983 fell on a Friday.