Saturday in the UK
August 13, 1961 fell on a Sunday.
October 13, 1961 fell on a Friday.
April 13, 1961 fell on a Thursday.
Monday
It was a Monday.
November 13th 1961 was a Monday.
August 13, 1961, was a Sunday.
January 13th 1961 was a Friday.
December 13th, 1961 fell on a Wednesday.
Dec 13th 1961 was a Wednesday.
March 13, 1961 fell on a Monday.
The given date was a Tuesday.