A thursday.
September 1st, 1988 fell on a Thursday.
February 1 1988 was a Monday.
March 1, 1988 fell on a Tuesday.
August 1, 1988 fell on a Monday.
January 1, 1988 fell on a Friday.
1 September 1970 was a Tuesday.
1 September 1946 was a Sunday.
1 September 1938 was a Thursday.
1 September 1964 was a Tuesday.
1 September 1958 was a Monday.
1 September 1962 was a Saturday.
September 1 1977 was on a Thursday.