On Mon, 27 Mar 2023 04:49:32 +0000, Gadi Ben-Avi  wrote:

>When I install a new version of z/OS in Israel I set the time zone in 
>SYS1.PARMLIB(CLOCKxx) and in /etc/profile. I set TZ to IST-2IDT.
>
On what date this year does that change the offset from IST to IDT?  By 
experiment
on MacOS, I see March 12, which is the convention for USA, not ISRAEL.

With TZ=IST-2IDT,M3.4.4/26,M10.5.0 I get March 26, which www.timeanddate.com
says is correct for Israel.

>Some USS based tasks have their own time zone setting which must be updated as 
>well. 
>
Why more than one?  Just one works fine on my desktop and phone.
Is it to support geographically distributed systems, or can IBM just not
get its act together?

>The time comes from STP which is set to UTC.
>
IBM recommends in the PoOps TAI-10 seconds, which is now UTC-27.

>STP get its time from enterprise NTP servers.
>
>Nothing comes preconfigured.
>
Ouch!  Does IBM not even suggest the correct strings for TZ for various 
locations?

-- 
gil

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