Monday.
January 23, 1988 was a Saturday.
October 23 1988 was a Sunday.
March 23, 1988 fell on a Wednesday.
September 23, 1988 fell on a Friday.
September 23, 1988 fell on a Friday.
August 23, 1988 fell on a Tuesday.
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, 1977 was a Monday