...does not start on first of January - no, new year starts when you are beginning to plan it!
In my case it was around end of November if I remember right. So when you want to schedule new year resolutions you are maybe good starting before the 31. December. Remember that the effects of your activities turn out later - the fruits of hard work are sometimes reaped a lot later. So if you scheduled new year resolutions don't get discouraged too early.
But what I am facing now: The effects of my plans for the new year from November already begin to show effect - I already think that I have planned too much for the new year. ;-)