Transcription
A map of the world with vertical lines marking the time zones from UTC-12 to UTC+12. It has a legend:
Wrong Time
"Natural time zones" are 15° in longitude. Land in red observes a time other than the zone it lies within. Smaller islands depict their 12 nautical mile territorial sea, for visual effect. In some cases this includes a state's archipelagic waters.
Plate Carrée projection, WGS-84 datum. December 2018 © International Mapping, all rights reserved.
They're basically doing the same thing China does. It just ends up looking even sillier because there's an international border between them and Germany.
Portugal's a little weird because they should he UTC-1, and unlike their neighbours they don't stretch their time massively by pretending to be in the same time zone as Germany. But they compromise by being in UTC.