Some apps (like Photos, Store) incorrectly display the time format. One format is installed by default (20.03.2018), but the wrong US is used (03/20/2018). Where is the dependency or synchronization enabled?
I believe 16299.15 (RS3) rolled out to the fast ring in October, it was compiled in late September though. So sure enough a final build could be released in Early April.
You guys are just begging for a new build. Relax and wait like the rest of us and quit guessing. None of you know when.