Re: Timezone?
You can set time preferences in the General admin area for local time and date -however in 1.9x I don't think it actually ever worked. On my installs it always just showed server time and also reset any calendar events to server time if you edited the event. Youy also had to edit the Calendar and add event template files to force it to use 12hr AM/PM time.
In 1.10 you can set local time and it works except you still cannot set 12hr AM/PM anywhere. Ricks99 tells me you can edit a different calendar template file but I'm having problems finding the spot to do it.
No idea on user time zones.
Uncle Geo