* Jonathan Wakely:
On Thu, 2 May 2024 at 08:18, Florian Weimer wrote:
* Jonathan Wakely via tz:
And that matches what glibc does: it finds the earliest transition with SAVE of zero, and uses that LETTER for the period before the first transition.
Do you mean zic instead of glibc? I don't think we have a .zi parser in glibc proper. We mostly bundle zic for historic reasons.
I mean glibc code such as: https://sourceware.org/git/?p=glibc.git;a=blob;f=time/tzfile.c;h=41475399643... The comment says it's finding the offsets, but it seems to be finding the abbreviations for the first two transitions, storing them in the __tzname array.
There's similar logic here: https://sourceware.org/git/?p=glibc.git;a=blob;f=time/tzfile.c;h=41475399643...
When I ran `TZ=Australia/Sydney date -d 1900-01-01` under gdb that seemed to be the code that decided on AEST, but maybe I got confused.
What I meant is that glibc isn't looking at LETTER, it's picking a precomposed time zone identifier. Thanks, Florian