User blog comment:TotallyTinkerbell/The year ?/@comment-4984687-20140416201730/@comment-25869525-20150108030243

If Jasper was wearing an Earth Day 2050 shirt, that means someone had to have bought the shirt in 2050, and afterwards had it in their luggage when they went up to one of the original stations the Ark was made from. So, it's possible that the shirt wasn't brand new the day it was brough up, parhaps a couple of years, though I'd say not likely much more than that.

So, I'd say late 2050 at earliest for the big war, maybe as late as 2055.