Saturday
That will depend on what day of the week the 1st of April is on. Whatever day of the week it is on, if you are taking the 8th of April as being 7 days later, then it will be on the day of the week after the day of the week of the 1st of April. So, for example, if the 1st of April was on a Saturday, then the 8th of April would be on a Sunday.
April 30 1989 was a Sunday.
April 12 1989 was on a Wednesday.
April 11 1989 was a Tuesday.
April 18, 1989 was a Tuesday.
April 13th 1989 was a Thursday.
April 10 1989 was a Monday.
April 26, 1989, was a Wednesday.
April 9, 1989 fell on a Sunday.
April 2, 1989 fell on a Sunday.
April 20, 1989 fell on a Thursday.
April 23, 1989 fell on a Sunday.