From: soren@debian.org 
  
 On Thursday, October 2, 2025 10:33:36€€€AM Mountain Standard Time Russ 
 Allbery 
 wrote: 
 > Soren Stoutner  writes: 
 > > Can you think of any way that using the Etc/GMT+12 and Etc/GMT-14 syntax 
 > > would cause any *problems*? 
 > 
 > Yes: Etc/GMT+12 and Etc/GMT-14 generate different time zone abbreviations. 
 > 
 > % env TZ=Etc/GMT+12 date 
 > Thu Oct  2 05:31:10 AM -12 2025 
 > % env TZ=Etc/GMT-14 date 
 > Fri Oct  3 07:31:14 AM +14 2025 
 > 
 > The point of using GMT+12 and GMT-12 is that they keep the same 
 > (incorrect, but it doesn't really matter for this purpose) time zone 
 > abbreviation for reproducibility testing: 
 > 
 > % env TZ=GMT+12 date 
 > Thu Oct  2 05:32:09 AM GMT 2025 
 > % env TZ=GMT-12 date 
 > Fri Oct  3 05:32:12 AM GMT 2025 
 > 
 > Otherwise, you may get spurious reproducibility failures due to the 
 > changed time zone abbreviation. 
 > 
 > I don't believe there is a mechanism to force the same time zone 
 > abbreviation other than usig POSIX rule-based zones. 
  
 Isn€€€t the exact *purpose* of the reproducible builds project to make sure 
 that 
 software compiles the same even when things like time zone abbreviations 
 are 
 different?  So, if this produces failures, aren€€€t these the exact types 
 of 
 failures the reproducible builds project is trying to uncover? 
  
 -- 
 Soren Stoutner 
 soren@debian.org 
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