It appears that you forgot to include the day in June. Since June is a month of a year, it consists of Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday.
June 1 1987 was a Monday.
On June 20th of 1968, the day was Thursday :)
September 28th, 1987 was a Sunday.
March 30 1987 was on a Monday.
November 28 1987 was on a Saturday.
28 June 1987 was a Sunday.
June 4th, 1987 was a Thursday.
June 4, 1987 was a Thursday.
June 18, 1987 fell on a Thursday.
June 5, 1987 was a Friday.
June 23rd, 1987 fell on a Tuesday.
It was a Friday.
It was a Sunday.
It was a Thursday.