On Sun, 23 Mar 2025 at 11:51, Aldrin Martoq Ahumada via tz <tz@iana.org> wrote:
> Can we keep the newly created America/Coyhaique? Look carefully at this particular patch: It only removes reference to America/Coyhaique from zonenow.tab, a file which is explicitly designed to list one (and only one) row for each region where civil timestamps are predicted to agree from now on. From this perspective, Aysén Region's now-year-round observation of UTC-3 matches Magallanes Region as well as Argentina and much of Brazil. Therefore, such regions are grouped together in that file under the updated comment "eastern and southern South America". This only affects tzselect when "now" mode is selected at the first prompt. (This patch satisfied our pre-release checks following my second commit for Aysén <https://github.com/eggert/tz/commit/ed0aff98da0938d196076d964c915b5934be036f> which updated the UNTIL date in the new America/Coyhaique zone and only affects the obsolescent isdst flag for a period of 17 days. Importantly, even if we hadn't changed the UNTIL date in that way, this patch to zonenow.tab would've quickly become necessary anyway as "now" continues to move forward.) The new zone entry for America/Coyhaique, defined in the southamerica file, remains referenced in zone1970.tab and the legacy zone.tab, the files more conventionally used by tzselect. It is available for use in the new tzdata version 2025b which was published yesterday. -- Tim Parenti
