When interviewing Roy McComb, he stated that he had been having his visions for nine months…
CHARLIE: How long have you been getting these feelings?
ROY McCOMB: Maybe… nine months.
The episode was aired September 23, 2008. That would put nine months ago at December 23, 2007. But one of the drawings on Roy’s wall is dated September 15, 2007.
I suppose it’s possible that the date the case is taking place is not in September, it could be happening in June or July of 2008.