Re: [tz] Tzdb and the Sunshine Protection Act

On 3/2/23 15:32, Paul Gilmartin via tz wrote:

The forms containing numbers are mandated by POSIX:

POSIX does not specify TZ strings like TZ='EST5EDT'; they are TZDB extensions. If you want a TZ string whose meaning is specified, you need something like TZ='EST5EDT,M3.2.0,M11.1.0'. You can see this by looking a few lines before the lines you quoted, which say that a TZ string contents are "std offset dst offset, rule". Admittedly this part of POSIX could be written more clearly.