On Thu, 31 Dec 2020 19:16:15 -0600, John McKown wrote:

>On Thu, Dec 31, 2020 at 7:15 PM Mike Schwab wrote:
>
>> https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
>> One example is EST+5EDT,M3.2.0/2,M11.1.0/2, so modify by 2 hours.
>
>I don't think z/OS supports that. But I haven't looked at 2.4.
>
I believe it has for a long time, for international support.

If you have a good desktop system, the last line in each individual
entry of /usr/share/zoneinfo/ is the POSIX format; probably good
for z/OS.  E.g.:
    547 $ tail -1 /usr/share/zoneinfo/America/Denver
    MST7MDT,M3.2.0,M11.1.0

Beware of:
    548 $ tail -1 /usr/share/zoneinfo/Asia/Tel_Aviv
    IST-2IDT,M3.4.4/26,M10.5.0

Some older OSes don't support the "/26" modifier.  Funny calendar there.

And:
    549 $ tail -1 /usr/share/zoneinfo/Europe/Dublin
    IST-1GMT0,M10.5.0,M3.5.0/1

Standard time in Summer; negative Daylight Saving in Winter!

-- gil

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