I tried to tell Windows to use UTC time by the registry hack. But I quickly realized that it's buggy. The Windows NTP will always set the system clock to local time regardless of the registry setting. On OI, I enabled ntp service to have it automatically set the correct time for me so Firefox will not complain about invalid https certificates. But I use Windows more than OI. The Windows NTP will not trigger automatically (when you need it), so I have to run it manually. This is inconvenient. I want to be able to set OpenIndiana to use local time instead.

p/s: this question is not specific to OI as it's also apply to illumos in general. Please help.