From a US perpetual calendar: April 1, 1987 was on Wednesday.
August 1, 1987 was on a Saturday.
April 1 1977 was on a Friday.
April 1 1967 was a Saturday.
April 1 2010 is a Thursday.
April 1 1948 was a Thursday.
April 1 , 2011 was a Thursday.
April 1, 2004 was on a Thursday.
April 1 1969 was a Tuesday.
April 1 1959 was a Wednesday.
April 1, 1981 was on a Wednesday.
April 1 2010 was a Thursday.