Works fine for me:
So presumably this is either a system bug with selecting the date or some sort of date formatting bug in the time zone.
Coming on the heals of this topic:
It does make me wonder if there are some bugs in Apple’s date formatting or calculation code (or potentially Keyboard Maestro’s code, but I don't immediately see how.
But this is very similar one day (technically 86400 seconds) change to the time resulting in incorrect dates.