use Time.now.utc instead of Time.now, closes #1421

lib/devise/models/confirmable.rb

@@ -34,7 +34,7 @@ module Devise
       def confirm!
         unless_confirmed do
           self.confirmation_token = nil
-          self.confirmed_at = Time.now
+          self.confirmed_at = Time.now.utc
           save(:validate => false)
         end
       end
@@ -71,7 +71,7 @@ module Devise
       # If you don't want confirmation to be sent on create, neither a code
       # to be generated, call skip_confirmation!
       def skip_confirmation!
-        self.confirmed_at = Time.now
+        self.confirmed_at = Time.now.utc
       end
 
       protected

lib/devise/models/lockable.rb

@@ -24,7 +24,7 @@ module Devise
 
       # Lock a user setting its locked_at to actual time.
       def lock_access!
-        self.locked_at = Time.now
+        self.locked_at = Time.now.utc
 
         if unlock_strategy_enabled?(:email)
           generate_unlock_token

lib/devise/models/trackable.rb

@@ -12,7 +12,7 @@ module Devise
     #
     module Trackable
       def update_tracked_fields!(request)
-        old_current, new_current = self.current_sign_in_at, Time.now
+        old_current, new_current = self.current_sign_in_at, Time.now.utc
         self.last_sign_in_at     = old_current || new_current
         self.current_sign_in_at  = new_current