I asked:

So, what covered Venezuela for just over half of the twentieth century, and returns this month (or possibly at the end of December) after more than forty years?

secritcrush

  got it right. The answer is:

The UTC -4:30 Time Zone.

This was Venezuela’s official time zone from 1912 to 1964; since then it has been on UTC -4 hours, the same as much of the Caribbean, Paraguay, Chile, New Brunswick, Nova Scotia, Prince Edward Island and most of Labrador. But now the clocks are to change by half an hour – though there has been some confusion about exactly when that will happen.

Though I must say that some of the other answers you suggested were pretty funny.