Tradeasy uses the GMT+0 timetable. You may consider the broker time one hour before the change of day in Forex and one hour later of your change of day. If your broker makes the change exactly at 12 AM; then when you activate your robot you must set opening time at 11 PM and closing time at 1 AM.
If you want more information about timetables, you can read the following article.
How do tradeasy timetables work?