1961 began on November 10, 1960.
I see some of you are scratching your heads in confusion; others are nodding sagely. It's a long-held tradition in the publishing industry that the date printed on magazines is the date through which they are expected to be on the bookstands, not the date they are first displayed. IF Science Fiction, a bi-monthly, comes out a full two months before it's "expiration date." Thus, I picked up a copy with a January 1961 stamp well before Thanksgiving 1960!
Since IF was acquired by the folks who bring us Galaxy Science Fiction, it has been something of a weak sister to that elder magazine. This month's issue may turn all that around.
(see why at Galactic Journey!)