Gentleman

I'm finding it difficult in some circumstances to reconcile times listed in some docs to others. A ship could in theory use local time or the time of their home port. When comparing British and German documents in theory a time could be GMT, local time or MEZ which becomes confusing.

Did U.boat logs use MEZ always by convention or would they sometimes use local time?

Did the Germans still adapt for daylight saving during the summer?

Please help!

James