Using {dats} gives the correct YYYYMMDD. {mdts} still changes at 8PM. Files process on 4/4 (just now): everything captured prior to 8PM is 20190403, and everything after 8PM is 20190404. I've been using {mdts} since I started using PhotoMechanic, which is October of 2016, and I've never had an issue. I'll change to {dats}, but it still begs the question because the files have the same creation and modification date/time. The files are from my backup device (a Nextodi ND2901) that makes a copy of my memory card. It has no internal clock so it doesn't set any date/time.