Mainland Portugal and the autonomous regions of Madeira and the Azores will move their clocks forward by one hour early on Sunday morning, marking the start of daylight saving time. In mainland Portugal and the Autonomous Region of Madeira, clocks will advance one hour at 01:00 on Sunday, becoming 02:00. In the Autonomous Region of the Azores, the change will take place at 00:00, moving to 01:00. Standard time will change again on 25 October for the winter period. The current clock change system is regulated by a 2000 European Union directive, which requires clocks to be moved forward and backward by one hour on the last Sunday of March and the last Sunday of October each year, marking the beginning and end of daylight saving time.