rename DateUtils to UserTime

app/models/preference.rb

@@ -22,6 +22,6 @@ class Preference < ActiveRecord::Base
       raise ArgumentError.new("Bad argument type:#{s.class}")
     end
 
-    DateUtils::midnight_for(self, date)
+    UserTime.new(user).midnight(date)
   end
 end

app/models/todo.rb

@@ -260,7 +260,7 @@ class Todo < ActiveRecord::Base
       activate
     else
       # parse Date objects into the proper timezone
-      date = DateUtils.midnight_for(user.prefs, date) if (date.is_a? Date)
+      date = UserTime.new(user).midnight(date) if (date.is_a? Date)
 
       # show_from needs to be set before state_change because of "bug" in aasm.
       # If show_from is not set, the todo will not validate and thus aasm will not save

app/models/user.rb

@@ -164,7 +164,7 @@ class User < ActiveRecord::Base
   end
 
   def date
-    time.midnight
+    UserTime.new(self).midnight(Time.now)
   end
 
   def generate_token