I've mentioned before that I used to go to Timmy's school many year ago. There's a very small possibility that depending on his current courses, he just might have been able to get away for his birthday. He could have been in Ohio for a long weekend and perhaps he doesn't have classes every day of the week. Like most schools of that type, attendance is part of your grade, but it is possible to miss some classes here and there if you clear it with the professor first. Logic would suggest that he just postpone his birthday week until spring break, but of course logic never applies with people like this.