Thursday. Check out the related link I added.
21 June 1955 was a Tuesday.
2 June 1955 was a Thursday.
22nd June, 1955, was a Wednesday.
June 14 1955 was a Tuesday.
June 13th 1955 was a Monday.
Monday, June 13, 1955
June 11, 1955, was a Saturday.
13th June 1955 was a Monday.
June 16, 1955 fell on a Thursday.
June 12, 1955 fell on a Sunday
June 27, 1955 fell on a Monday.
June 5, 1955 fell on a Tuesday.