I forgot to mention, another famous person Joplin, Janis 19/01/1943 09:45:00 Port Arthur TX, United States, 93w57, 29n53, America/Chicago

Olson database gives the same as astrodatabank, 5 hours. This is to show that the results are not consequently wrong. My impression is that the area is so big there are expceptions but i'm a layman so..

On 12/11/2019 21:23, Paul Eggert wrote:

On 11/9/19 3:51 AM, Jean via tz wrote:

There are other problems, like the America/Chicago timezone which is notorious for giving false results for years before 1970

Although Matt addressed your other points, I'm curious about this one. In what sense is tzdb's America/Chicago "notorious" for being wrong? I used Google to search for '"America/Chicago" false results' and the only hits I came up with were downstream bugs (e.g., in PHP installation, or in mistaken use of Python primitives), not bugs in tzdb itself.