(Unless some of this has changed in the last couple of years.)
I time mastered one of the largest banks in the world a few years ago (for Windows servers) and learned far to much about this.
When I first started using my machine in January, I lost a session or two, apparently due to correcting the time on the machine (probably that setting it backwards issue.)
Forward setting time is always less troublesome than setting it backwards. Forward setting "skips time" but backward adjustments cause the "same time" to happen twice.
Confusing for humans but nearly mind blowing to computer programs not build for such things.
Sleep study AHI: 49 RDI: 60 -- APAP 10-11 w/AHI: 1.5 avg for 7-days (up due likely to hip replacement recovery)
"We can all breathe together or we will all suffocate alone."