Re: [tz] [tz-announce] 2018f release of tz code and data available

On 10/22/18 11:22 PM, Florian Weimer wrote:

I mainly meant how to adjust the transition rules to get a proper POSIX rule. Is this always possible?

No, because POSIX does not allow settings like TZ='GST3GDT,M3.5.0/-2,M10.5.0/-1', where the '-2' is short for '-02:00' and means that in spring the transition is at 22:00 on the day before the last Sunday in March. There is no POSIX-conforming equivalent to this. We should fix POSIX to allow times outside the 00:00-24:00 range, since they are used in practice. Glibc supports them, and other POSIX-compatible implementations do too. For example, run the command 'tail -n1 /usr/share/zoneinfo/America/Godthab' on a Red Hat platform.