1 files changed, 20 insertions, 3 deletions
diff --git a/activesupport/lib/active_support/core_ext/time/zones.rb b/activesupport/lib/active_support/core_ext/time/zones.rb
index bbda04d60c..877dc84ec8 100644
--- a/activesupport/lib/active_support/core_ext/time/zones.rb
+++ b/activesupport/lib/active_support/core_ext/time/zones.rb
@@ -1,4 +1,5 @@
 require 'active_support/time_with_zone'
+require 'active_support/core_ext/time/acts_like'
 require 'active_support/core_ext/date_and_time/zones'
 
 class Time
@@ -25,7 +26,7 @@ class Time
     # <tt>current_user.time_zone</tt> just needs to return a string identifying the user's preferred time zone:
     #
     #   class ApplicationController < ActionController::Base
-    #     around_filter :set_time_zone
+    #     around_action :set_time_zone
     #
     #     def set_time_zone
     #       if logged_in?
@@ -50,12 +51,22 @@ class Time
       end
     end
 
-    # Returns a TimeZone instance or nil, or raises an ArgumentError for invalid timezones.
+    # Returns a TimeZone instance matching the time zone provided.
+    # Accepts the time zone in any format supported by <tt>Time.zone=</tt>.
+    # Raises an +ArgumentError+ for invalid time zones.
+    #
+    #   Time.find_zone! "America/New_York" # => #<ActiveSupport::TimeZone @name="America/New_York" ...>
+    #   Time.find_zone! "EST"              # => #<ActiveSupport::TimeZone @name="EST" ...>
+    #   Time.find_zone! -5.hours           # => #<ActiveSupport::TimeZone @name="Bogota" ...>
+    #   Time.find_zone! nil                # => nil
+    #   Time.find_zone! false              # => false
+    #   Time.find_zone! "NOT-A-TIMEZONE"   # => ArgumentError: Invalid Timezone: NOT-A-TIMEZONE
     def find_zone!(time_zone)
       if !time_zone || time_zone.is_a?(ActiveSupport::TimeZone)
         time_zone
       else
-        # lookup timezone based on identifier (unless we've been passed a TZInfo::Timezone)
+        # Look up the timezone based on the identifier (unless we've been
+        # passed a TZInfo::Timezone)
         unless time_zone.respond_to?(:period_for_local)
           time_zone = ActiveSupport::TimeZone[time_zone] || TZInfo::Timezone.get(time_zone)
         end
@@ -71,6 +82,12 @@ class Time
       raise ArgumentError, "Invalid Timezone: #{time_zone}"
     end
 
+    # Returns a TimeZone instance matching the time zone provided.
+    # Accepts the time zone in any format supported by <tt>Time.zone=</tt>.
+    # Returns +nil+ for invalid time zones.
+    #
+    #   Time.find_zone "America/New_York" # => #<ActiveSupport::TimeZone @name="America/New_York" ...>
+    #   Time.find_zone "NOT-A-TIMEZONE"   # => nil
     def find_zone(time_zone)
       find_zone!(time_zone) rescue nil
     end