Since Second Life's headquarters are located in
Fortunately, I happen to live in the same time zone in one of the best cities in the world, Vancouver, British Columbia, Canada so I'm on SLT all the time, even when Daylight Saving Time comes into play. This can be confusing for most of us who aren't used to thinking outside our own zones!
Forget trying to add and subtract hours from Greenwich Mean Time (GMT) or some such silly thing (for those of us who are numerically challenged) , just go to WorldClock.com and look for your city and a city anywhere on the west coast of North America and you can easily figure out where to be when!
Update: Found another useful site: http://www.timeanddate.com/worldclock/converter.html.