User blog comment:Commdor/Weekly ANN Reports from the BioWare Blog/@comment-1221773-20120204032307

Did some nerd math. The first ANN report is dated August 24, 2186. If the in-universe dates follow the weekly release pattern for the reports and the reports immediately precede the Reaper invasion and ME3 itself, it's possible that September 24, 2186 is day the Reapers attack Earth.

Some tenuous logic in there (it depends a lot on a 1:1 correlation in our time and ME universe time), but somehow I find it gratifying that I can chart a date for this. :P