Time Zones in Rails 3

I was looking for what options I could use to set the time zone config in application.rb.  The best I could find were these posts in Stack Overflow:



essentially they are (for the biggest US zones):

Pacific Time (US & Canada), Central Time (US & Canada), Eastern Time (US & Canada)

The posts are good to reference nonetheless, as there seems to be a lot of confusion on what the config does (and time helpers).