When do you put up your Christmas tree?

I know, I know - it's still September (although only just)!

If you're among those of us who celebrate Christmas - or who otherwise enjoy the seasonal decorations and festivities - when do you prefer to put your tree up?

In my case, I've been stealthily bringing the date forward over each of the last few years. I love the twinkling tree lights, sitting to the side of my view in the living room each evening. And I find it generally helps to lift my mood 

I wondered whether anyone else here might also be in the habit of banking extra seasonal pleasure by doing the same?