I'm new...to this list and at my new job...
Question about setting the clock:

Haven't IPL'd in 4 months, so tonight I'm going to IPL the production z/OS 1.7 
LPAR and similar test LPAR (each a monoplex) to pick up a new 
SYS1.PARMLIB(CLOCK00) with a different offset to Greenwich Mean Time (7 instead 
of 8 for Pacific).  Shutdown will quiesce everything nicely.  Systems are 
simple, mostly CICS and MQ.  And I come from more of an internals/development 
background, and haven't been around operations nor hardware lately.  Question 
is: do I have to reset any secondary time of day clock that the HDC (this is 
some kind of Z9 with a HDC that I think runs some kind of UNIX as its embedded 
system??) uses for things like hardware time stamps or knowing when to "call 
home" or something?  My point is, GMT did not change, so I don't need to change 
any hardware CPU TOD clock for z/OS (not like the old days when we'd set to 
local).  But do I need to make other clock changes for the HCD part of the 
"hardware" itself or does it operate on GMT or something?  If I need to do 
more, what's involved?  Do I need to do some kind of power-on reset?  For the 
LPAR or for the whole box or whole HCD?  Or does IBM take care of that?

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