Trump tweets on 'chocker' occurred on 2/26/2016 about Rubio and 2/26/2020 about Warren.
Q Posts didn't start till October 2017 so a review of 2/26/2018 revealed no Q Posts on that date. A review of 2/26/2019 Posts revealed many relevant threads.
When you hear T-19 it means that we have 21 days from 2/26/2020. Today is 2/28/2020 so it's 'T-19'.