mrinterweb/grouped_time_zones — pull request #3 by jrmyward (2013-06-20 22:25:13+00:00)
Title: Feature/force unique time zone values

Added ability to force a unique list of timezones based on the tzinfo identifier attribute.

Basically, this prevents multiple time zone values from appearing as select options. Example: "Pacific/Midway" would only appear once.