WET is not heavily split in the current catalog, but the short label still hides the underlying IANA zone and any future policy change. The safe pattern is to write the abbreviation for humans and the zone for machines.
Africa/Casablanca has an upcoming offset change on February 7, 2027. After that point, WET on this page will read a different UTC offset until the next transition, so any saved timestamp should anchor to the IANA zone rather than the abbreviation.
For precise work, the safest equivalent of WET is the exact IANA zone used by your city or system. Africa/Casablanca sits at +01:00, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.
Even with one canonical meaning, WET spans 5 IANA zones — pin to Africa/Casablanca when DST or historical-rule precision matters.