Q said clock started on 12/7 minus 10 days
If we count relative to the Q clock it started on 11/27 (12/7 - 10 = 11/27)
Q, when asked about flynn said "done in 30"
11/27 + 30 = 12/27
12/27 lines up with Qs very first post on 10/28 it also lines up with 12/22/18
Pic related, included blank one cause i accidentally covered up 12/22