>>4164792 (lb)
Test of the mirror dates calendar theory for this week:
December 3, 2018 -→ mirror date = December 7, 2018
D5 posts on 12/3/2018:
NOTE: I searched "68–95–99.7 rule" that was mentioned in Q's post on this date, and the graphic on the search results page looks like a MIRROR.
http://www.oswego.edu/~srp/stats/images/normal_34.gif
December 2, 2018 -→ mirror date = December 8, 2018
Huber posts on 12/2/18:
>>4115084 (pb)
>>4115161 (pb)
>>4115264 (pb)