11th December 1978 was a Monday.
December 11th 1968 was a Wednesday.
Sunday
Thursday
It was a Saturday.
it was a thursday.
From a perpetual calendar: May 11, 1939 was on a Thursday.
December 11th, 1980 was a Thursday.
December 11 1979 was a Tuesday.
Friday
December 11th, 1982 fell on a Saturday.
December 11th, 2003 fell on a Tuesday.