Having lived in the Netherlands for most of my life (yes, still), Christmas as I mentioned before was celebrated for its religious reason only in our home. Yes, we did have a tree, but there were no gifts underneath. And all I knew about Christmas came from the very few Christmas films I had seen by then. Which all mention that Father Christmas or Santa Claus comes at night and delivers his presents in time for Christmas Day.
We of course got them three weeks early, thanks to Saint Nicholas, but other nations also have other customs. The German speaking nations of Germany, Austria, Switzerland and Liechtenstein (look it up) unwrap their presents on Christmas Eve. They too used to do so on Saint Nicholas, but the protestants didn't like saints, they moved it to after Christmas Mass on Christmas Eve, but that was found to be too late for the children and they now do it at an earlier time on Christmas Eve.
In Norway Christmas Eve again is the most important day for gifts. The Norwegian Santa is a blend of Saint Nicholas, Santa Claus and the old 'farm man'*. He makes an appearance in a lot of households on Christmas Eve asking whether there are any nice children around, after which presents are given.
And us? When do we open our presents? Well, that depends on when Santa comes to us...
*The old farm man (closest I got to translating/explaining) is a figure in Norwegian folklore. He is different in different parts of the country, but basically he was the one who looked after the farm. Not literally though. At Christmas he wanted a bowl of porridge and there are still quite a few people who will put out a bowl of porridge on Christmas Eve for him (and his family).