I think the answer MIGHT BE Saturday.
December 16th, 1967 fell on a Saturday.
16th December 1984 was on a Sunday.
December 16th, 2010 fell on a Thursday.
December 16th, 2001 fell on a Sunday.
December 16th, 1971 fell on a Thursday.
December 16th, 1945 fell on a Sunday.
July 16th 1967 was a Sunday.
Friday
It was a Sunday.
26 December 1967 was a Tuesday.
25 December 1967 was a Monday.
December 3 1967 was a Sunday.