Thomas M Steenholdt wrote:
From what I've seen, PHP (on Ubuntu) had some hiccups and started mentioning Sao Paolo in my date/time outputs, because WGT/WGST was suddenly missing:
As I understand from <https://bugs.launchpad.net/ubuntu/+source/tzdata/+bug/1734967>, PHP attempts to guess the tzdb Zone name (e.g., "Europe/Berlin") from the abbreviation and UT offset, which is the sort of thing that we have long explicitly warned should not be done because abbreviations are ambiguous. Although you may now have noticed the problem with Western Greenland and Sao Paolo, surely other users can run into similar problems with (say) Algeria and Berlin. (Algeria and Germany have the same standard UT offset but differing DST rules, and in that respect are like western Greenland vs. southern Brazil.) I'm afraid that the sources that you mention are derived from tzdata. Generally speaking, we're looking for general-interest English-language sources, such as newspapers, magazines, books and the like. A few tzdata-derived abbreviations have made it into popular usage, and we've kept them.