tz-rails

timezone:
  - info
    source for TZInfo is 'cat /usr/share/zoneinfo/zone.tab'
    rails uses this as standard ::ActiveSupport::TimeZone.all
    rake time:zones:all
  - test:
    raises an error
      Time.zone='Fuck'
      gem open tzinfo

  - https://github.com/rails/rails/blob/master/activesupport/lib/active_support/values/time_zone.rb
    132 ActiveSupport::TimeZone::MAPPING.values.uniq
    149 ActiveSupport::TimeZone::MAPPING.values
    149 ActiveSupport::TimeZone.send(:zones_map).values.map(&:name)
    149 ActiveSupport::TimeZone.all.map(&:name)

  - https://github.com/tzinfo/tzinfo/blob/master/lib/tzinfo/timezone.rb
    416 TZInfo::Timezone.all_country_zones.size
    583 TZInfo::Timezone.all_identifiers
    016 TZInfo::Country.get('BR').zones
    029 TZInfo::Country.get('US').zones
    034 ::ActiveSupport::TimeZone.all.uniq(&:formatted_offset)
    034 ::ActiveSupport::TimeZone.all.uniq(&:formatted_offset).map(&:formatted_offset)

  - config
    config.time_zones = ["UTC", "Midway Island", "American Samoa", "Hawaii", "Alaska", "Pacific Time (US & Canada)"]
    config.time_zones = ActiveSupport::TimeZone.send(:zones_map).values.map(&:name)
  - Hello
    Hello.available_timezones
    Hello.all_available_timezones - shortcut for one of the above commands



to work on rails
  - externalize the filtering logic found in form helpers to methods of ActiveSupport::TimeZone

      # Returns select and option tags for the given object and method, using
      # #time_zone_options_for_select to generate the list of option tags.
      #
      # In addition to the <tt>:include_blank</tt> option documented above,
      # this method also supports a <tt>:model</tt> option, which defaults
      # to ActiveSupport::TimeZone. This may be used by users to specify a
      # different time zone model object. (See +time_zone_options_for_select+
      # for more information.)
      #
      # You can also supply an array of ActiveSupport::TimeZone objects
      # as +priority_zones+, so that they will be listed above the rest of the
      # (long) list. (You can use ActiveSupport::TimeZone.us_zones as a convenience
      # for obtaining a list of the US time zones, or a Regexp to select the zones
      # of your choice)
      #
      # Finally, this method supports a <tt>:default</tt> option, which selects
      # a default ActiveSupport::TimeZone if the object's time zone is +nil+.
      #
      #   time_zone_select( "user", "time_zone", nil, include_blank: true)
      #
      #   time_zone_select( "user", "time_zone", nil, default: "Pacific Time (US & Canada)" )
      #
      #   time_zone_select( "user", 'time_zone', ActiveSupport::TimeZone.us_zones, default: "Pacific Time (US & Canada)")
      #
      #   time_zone_select( "user", 'time_zone', [ ActiveSupport::TimeZone['Alaska'], ActiveSupport::TimeZone['Hawaii'] ])
      #
      #   time_zone_select( "user", 'time_zone', /Australia/)
      #
      #   time_zone_select( "user", "time_zone", ActiveSupport::TimeZone.all.sort, model: ActiveSupport::TimeZone)
      def time_zone_select(object, method, priority_zones = nil, options = {}, html_options = {})
        Tags::TimeZoneSelect.new(object, method, self, priority_zones, options, html_options).render
      end