tz = TZInfo::Country.get("JP") => #<TZInfo::Country: JP> tz.zone_names => ["Asia/Tokyo"] tz = TZInfo::Country.get("US") => #<TZInfo::Country: US> tz.zone_names => ["America/New_York", "America/Detroit", "America/Kentucky/Louisville", "America/Kentucky/Monticello", "America/Indiana/Indianapolis", "America/Indiana/Vincennes", "America/Indiana/Winamac", "America/Indiana/Marengo", "America/Indiana/Pet