Tuesday
August 9th, 1979 fell on a Thursday.
The 9th of August can occur on any day of the week. As the question was asked in July 2014, it is possible you were referring to August of 2014, in which case the answer is Saturday.
Thursday
its on a Monday!
Tuesday
It was a Monday.
Thursday
9th July 1994 was a Saturday.
27 August 1994 was a Saturday.
August 22 1994 was a Monday.
12th August 1994 was a Friday.
August 12 1994 was a Friday.