From a perpetual US calendar: April 24, 1964 was on Friday.
April 16 1964 was a Thursday.
9 April 1964 was a Thursday.
4 April 1964 was a Saturday.
17 April 1964 was a Friday.
April 12 1964 was a Sunday.
19 April 1964 was a Sunday.
April 13, 1964 fell on a Monday.
April 11, 1964 fell on a Saturday.
April 27, 1964 fell on a Monday.
April 18, 1964 fell on a Saturday.
April 8, 1964 fell on a Wednesday.
April 10, 1964 fell on a Friday.