February 11 1971 was on a Thursday.
Saturday. Source. http://www.courts.sa.gov.au/lawyers/magistrates_benchbook/perpetual_calendar/Pat01.htm
Thursday
it was a Thursday
It was a Tuesday.
It was a Wednesday.
February 11 1953 was a Wednesday.
February 11 1982 was a Thursday.
February 11 1990 was a Sunday.
February 11 1976 was a Wednesday.
February 11 2010 was a Thursday.
February 11, 1949 was a Friday.
February 11, 1963, was a Monday.
Saturday
Thursday
11th October 1971, was a Monday.
February 11, 1977 fell on a Friday.
February 11, 2004 fell on a Wednesday.