12 Day's of Christmas

[hermioneee]

Is between Christmas and 6th January, not before.
Please, all businesses, stop using it as an excuse to sell 'advent' calendars on the cheap.
See also, prizes and competitions.

OMG and I'm so so sorry about the apostrophe. Please forgive me pedants!

Advent and the 12 days of Christmas are not the same thing

Exactly! So don't sell or promote "12 days of Christmas" goods during Advent. It's become really common the past few years,

I'm sorry, but you know that errant apostrophe totally invalidates everything thing else that you have posted.

It has. You are quite right!