On Thu, 12 Nov 2020 14:09:48 +0000, Rupert Reynolds wrote:
>
>But MVS 3.8 (I checked SYS1.AMODGEN(CVT) ) doesn't have any reference to
>leap seconds i can see. I suppose it was up to ops to adjust the time, and
>TOD intervals would be out by a second across the leap second, but it makes
>TOD time a bit easier to convert.
>
Historian? Bitsavers? Nowadays the field is CVTLSO:
https://www.ibm.com/support/knowledgecenter/SSLTBW_2.2.0/com.ibm.zos.v2r2.iead100/iead100564.htm
In the earliest protocol, Sysplex Timer dialed NIST for UTC.
https://www.nist.gov/time-distribution/automated-computer-time-service-acts
I believe IBM charged dearly for a 1200 baud modem feature.
Target TOD to UTC and it struggled for several hours to fall in sync.
It's pointless to run 3.8 with a TOD setting (TAI-10 seconds) that
OS doesn't support.
-- gil
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