Okay, so, the season 3 halloween special obviously took place on October 31. But, the season 5A finale takes place on thanksgiving. WHAT?! It's still the liars' senior year. So, that means that season 3B, all of season 4, and season 5A all took place in November. The fact that there was a Christmas special (which obviously took place on December 25) and that the season 5B premiere takes place 3 months later (it says it at the beginning of the episode) makes it even clearer. There's no possible way that everything from the night of the lodge fire to charlotte abducting mona all took place in one month. I really wish they would have done a much better job with the timeline. Especially considering all the timeline plot holes in the show.