It was a Saturday.
December 12 can fall on any day of the week.
8 December 1945 was a Saturday.
December 31 1945 was a Monday.
December 18, 1945 fell on a Tuesday.
December 29, 1945 fell on a Saturday.
December 16th, 1945 fell on a Sunday.
Wednesday
It was a Sunday.
It was a Thursday.
It was a Sunday.
It was a Friday.
It was a Thursday.