Portugal Time (Mainland and Madeira) is in the Western European Time Zone. Western European Standard Time (WET) is Greenwich Mean Time (GMT). Like most states in Europe, Summer (Daylight-Saving) Time is observed in Portugal Time, where the time is shifted forward by 1 hour; 1 hours ahead of Greenwich Mean Time (GMT+1).ike most states in Europe, Summer (Daylight-Saving) Time is observed in Portugal Time, where the time is shifted forward by 1 hour; 1 hours ahead of Greenwich Mean Time (GMT+1).