#106 Time Zones (revised)

Oct 28, 2012 | 7 minutes | Active Support

Active Support makes it easy to work with time zones. Learn how to add a Time Zone select field to a user form and watch out for the gotchas.

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          terminal
        
rake time:zones:all
rake time:zones:local
rails g migration add_time_zone_to_users time_zone
rake db:migrate

          rails console
        
h = Haiku.last
h.published_at
h.published_at_before_type_cast
Time.now
Time.zone.now
Time.now.class
Time.zone.now.class
Time.now.in_time_zone
Date.today
Date.current
Time.zone.now.to_date # or Time.zone.today
Time.zone.parse("Jan 1, 2010")
4.weeks.ago

          config/application.rb
        
config.time_zone = 'Central Time (US & Canada)'

          models/user.rb
        
validates_inclusion_of :time_zone, in: ActiveSupport::TimeZone.zones_map(&:name)

          application_controller.rb
        
around_filter :user_time_zone, if: :current_user

private

def user_time_zone(&block)
  Time.use_zone(current_user.time_zone, &block)
end

          users/_form.html.erb
        
<div class="field">
  <%= f.label :time_zone %><br />
  <%= f.time_zone_select :time_zone, ActiveSupport::TimeZone.us_zones %>
</div>