The Question and Answer section for The Perks of Being a Wallflower is a great resource to ask questions, find answers, and discuss the novel.
Situational Irony: Page 20
Charlie assumes Patrick and Sam are dating when in reality they're siblings.
" I looked at them, and they looked really happy together. A good kind of happy. And even though I thought Sam was very pretty and nice, and...
Charlie was awake and bored. He calle the number because it was available, and because he knew someone would be on the other line.
I'm not finding any information that correlates with your question. I don't even see a diary entry for 1/4 or January 4th. Please check your question and correct if necessary.