March 20 1959 was a Friday.
September 20, 1959 fell on a Sunday.
Monday
It was a Friday.
October 20, 1959, was a Tuesday.
July 20, 1959 fell on a Monday.
December 29th, 1959 fell on a Sunday. The following year, it fell on a Tuesday.
59 + 14 + 20 + 1 = 94 - 91 = 3 = Tuesday ■
May 20 1965 was on a Thursday.
20 May 1942 was a Wednesday.
May 20 1971 was a Thursday.
May 20, 1955, was a Friday