May 20, 1989 was a Saturday.
June 20 1989 was a Tuesday.
March 20 1989 was on a Monday.
August 20, 1989 fell on a Sunday.
April 20, 1989 fell on a Thursday.
Friday
It was a Thursday.
Wednesday
November 20th, 1989 fell on a Monday.
Caramell says: Friday~
From a US perpetual calendar: September 20 1989 was on Wednesday.
20 May 1942 was a Wednesday.
May 20 1971 was a Thursday.