It was a Friday.
30th April 1957 was a Tuesday.
April 30th, 1935 fell on a Tuesday.
April 30th, 1968, was a Tuesday.
April 30th, 1999 fell on a Friday.
April 30th, 2013 fell on a Tuesday.
The 30th May 2010 will be on a Sunday.
July 30th, 2010 was a Friday.
January 30th is Saturday of the 5th week.
December 30th, 2010 fell on a Thursday.
It depends what year you're asking about. April 30th 2013 was a Tuesday.
Wednesday
It was on a Saturday