It was a Sunday.
May 13 1955 was a Friday.
November 13, 1955 was a Sunday.
January 13, 1955, was a Thursday.
January 13, 1955 fell on a Thursday.
August 13, 1955 fell on a Saturday.
October 13, 1955 fell on a Thursday.
Wednesday
Thursday.
Sunday.
June 13th 1955 was a Monday.
Monday, June 13, 1955
13 February 1965 was a Saturday.