It was a Monday.
July 20, 1968 was a Saturday.
February 20, 1968 was a Tuesday.
On June 20th of 1968, the day was Thursday :)
September 20, 1968 fell on a Friday.
January 20, 1968 was a Saturday.
Wednesday
April 20th 1968 was a Saturday.
Wednesday
20 May 1942 was a Wednesday.
May 20 1965 was on a Thursday.
May 20 1946 was on a Monday.
20 May 1958 was a Tuesday.