On Sat, Apr 06, 2024 at 10:29:10AM +0700, Đoàn Trần Công Danh wrote: > CST6CDT and the like are POSIX timezone, with no rule for transition. > And POSIX doesn't enforce how to interpret the rule if it's omited. > Some libc resorted back to IANA (formerly Olson) db rules for those > timezones. Other libc (e.g. musl) interpret that as no transition at > all [1]. > > In addition, distributions (notoriously Debian-derived, which uses IANA > db for CST6CDT and the like) started to split "legacy" timezones > like CST6CDT, EST5EDT into `tzdata-legacy', which will not be installed > by default [2]. > > In those cases, t9604 will run into failure. > > Let's switch to POSIX timezone with rules to change timezone. This made me wonder if we are losing EST5, etc. We use that in t0006, for example. But I guess not, since I do not have tzdata-legacy installed (I am on Debian unstable) and haven't run into issues (I didn't notice the cvsimport one because I lack other prereqs to run those tests). -Peff
