Forex Robotron trades 21-22 GMT when USA DST is on (i.e. summer) and 22-23 When USA DST is off (i.e. winter). You do not need to adjust the hours during summer or winter, the hours are already set for you and GMT is automatically calculated by the EA. These are by far the best trading hours for Forex Robotron based on historical testing over many years, they produce enough trades with high accuracy.