It was a Saturday.
Sept 30 1994 was a Friday.
Tuesday
September 30, 1959 was a Wednesday.
September 30, 1962 fell on a Sunday.
June 30, 2006 was a Friday.
November 30 2006 was a Thursday.
April 30, 2006 was a Sunday.
Monday
It was a Tuesday.
There are only 30 days in June, so there was no 31st. However, June 30th, 2006 fell on a Friday.
That day was a Monday.
That day was a Thursday.