I attach optimization patch for NativeDate that makes all js... methods private, removes passing of unnecessary parameters and replaces checkInstance by realThis call with false as the third parameter. Regards, Igor Hi, Norris! Here is another small optimization for NativeDate in DayFromMonth method where it replaces arrays by few ifs. Regards, Igor git-svn-id: svn://10.0.0.236/trunk@92558 18797224-902f-48f8-a5cc-f745e15eee43