On Wednesday, October 8, 2025 2:15:53 PM Mountain Standard Time Vagrant Cascadian wrote: > We can test consitent timezones, rather than relying on timezones that > may or may not have daylight savings time such that a package might > build reproducibly with or without daylight savings time. > > Even if we can find sufficiently divergent timezones that happen to not > have daylight savings time today, there is no guarantee that that a > particular Continent/City will not institute daylight savings time at a > later date, or even change timezone entirely. > > Using UTC offsets avoids all of that mess. > > It also allows us to make sure at least the day changes, by having > offsets spanning over 24 hours (e.g. UTC+12 and UTC-14 ~= 26 hour time > difference, and which is actually represented in the real world due to > countries that span the international date line).
Using consistent and divergent timezones that do not implement daylight savings time is indeed an important consideration. I think that is fully addressed by using the Etc/GMT+12 and Etc/GMT-14 syntax. Please note, as described in the original bug report: “The special area of "Etc" is used for some administrative zones, particularly for "Etc/UTC" which represents Coordinated Universal Time. In order to conform with the POSIX style, those zone names beginning with "Etc/GMT" have their sign reversed from the standard ISO 8601 convention. In the "Etc" area, zones west of GMT have a positive sign and those east have a negative sign in their name (e.g "Etc/GMT-14" is 14 hours ahead of GMT).” https://en.wikipedia.org/wiki/Tz_database#Area On Wednesday, October 8, 2025 1:41:17 PM Mountain Standard Time Guillem Jover wrote: > As was mentioned on the list thread, this change would require for tzdata > to be installed everywhere, otherwise the results are bogus (AFAIUI). There may be some great difficulty caused by making tzdata a dependency of reprotest. If there is I would be interested in know what it is. It should be noted that the reproducible builds project successfully builds this package. https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ pyinstaller-hooks-contrib.html My memory is that didn’t used to be the case. So, either my memory is wrong or reproducible builds recently started using the Continent/City (zoneinfo) syntax. In either case, I think it would be advantageous for reprotest (and the Salsa CI test that uses it) to mirror the behavior of reproducible builds. -- Soren Stoutner [email protected]
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