daylights savings time going away renders preferences incorrect

[rgarcia]

Right now if you are in San Francisco you would specify -0700 as your timezone.

However, when daylight savings time ends on November 1st, your timezone switches to -0800.

One way we could support this: input your physical location, e.g. San Francisco, convert it to lat/lon, and then use something like the google time zone API to convert that to a UTC offset https://developers.google.com/maps/documentation/timezone/

Alternatively we could make it easier for users switch their UTC offset as necessary.