WTF with the timeline?
The first four seasons are pretty straight forward. Each season occurs in the respective year it was aired in. Seasons 5,6, and 7 all appear to take place within a few months. It's kind of annoying when all the kids still age three years in the meantime....
EDIT: The children are only one aspect of the problem.
Season 1 is clearly set in 2002 and Season 4 is clearly in 2005. Danny is not even (or just barely pregnant) at the end of Season 4, and ready to pop at the beginning of 5, making Season 5 at least 7-8 months after Season 4. This would make it, at the very least, 3 1/2 years after Terry was killed. It's mostly likely 4+ years at that point.
Yet, at the beginning of Season 5, Kavanaugh says Terry died 2 1/2 years ago. That makes no sense. At the end of Season 7, Dutch tells Ronnie he's under arrest for the "last three years", which also makes no sense. The show, at minimum, covers four years of events. More likely five.
Please stop.