The timezones in Portugal
There are several timezones in Portugal. Countries with a large distance from West to East are often devided into two or more timezones to adjust daytimes to the position of the sun. Timezones are always computed relatively to UTC, the "Universal Time Coordinated".
In Portugal exists a time difference of 1 hour between the East and the West. They have a nationwide clock change from standard time to daylight saving time, where the clocks are switched forward by 1 hour in summer.
The next clock change in Lisbon will be on October 25th, 2020 at 2:00 to standard time. Back to overview: Portugal