The calendar built-in to Windows could have saved you asking this question - it was a Friday.
April 4, 1988 on a Monday.
April, 25th, 1988, was a Monday.
April 12th, 1988 fell on a Tuesday.
April 18, 1988 fell on a Monday.
April 22, 1988 fell on a Friday.
April 28, 1988 was a Thursday.
Monday
Roseanne - 1988 April Fool's Day 2-22 was released on: USA: 10 April 1990
January 8, 1988, was a Friday.
August 8, 1988, was a Monday.
Day by Day - 1988 What I Did for Love 1-7 was released on: USA: 3 April 1988
8 March 1988 was a Tuesday.