The Shining movie question?

I've seen the Shining 3 times now, but there is still one part I don't understand. Towards the beginning mrs. Torrance says that some good has come from Jarck hurting Danny, that he quit drinking after he hurt him, and she says that was 5 months ago. But then at the bar, when Jack is wih Lloyd, Jack says about how he will never be able to live it down and that it was 3 years ago. Is there something I'm missing here or is it just part of Jack losing his mind?