Monday.
October 23 1988 was a Sunday.
January 23, 1988 was a Saturday.
March 23, 1988 fell on a Wednesday.
August 23, 1988 fell on a Tuesday.
September 23, 1988 fell on a Friday.
September 23, 1988 fell on a Friday.
Wedesday
a Friday in the UK
June 23, 1988 fell on a Thursday.
It was a Monday.
May 23 1967 was on a Tuesday.
May 23 1972 was on a Tuesday.