I've found really good timelines with sources.

I was just hoping that there was something 'official' from WotC.
I did find something outlining what you said above -> 1e is up to 1358, 2e is up to 1368 and 3e is up to 1372. But, I've found examples that don't work with 2e and 3e. For example, the 2e supplement "For Duty and Deity" takes place in late 1370.
On a only slightly related note, why was Blackstaff dealing with Fzoul? Also, what's the deal with daemonfey/fey'ri? (Today is the first I heard of either one of these.)