Thursday.
It was on Sunday the 14th of May in 1989.
1 January 1989 was a Sunday.
13 July 1989 was a Thursday.
23 September 1989 was a Saturday.
9 July 1989 was a Sunday.
September 8 1989 was on a Friday.
April 12 1989 was on a Wednesday.
July 25 1989 was on a Tuesday.
April 30 1989 was a Sunday.
March 20 1989 was on a Monday.
July 15 1989 was a Saturday.
June 21 1989 was on a Wednesday.