The command doesn't change the clock, just the offset. SET TIMEZONE
xxx, where xxx is one of the defined timezones in the output of Q
TIMEZONES. Assuming they are set correctly, you should be able to
change VMs time offset without an IPL. I say should because some
applications may not like the time to change. You need to determine
that internally. If all you are doing is running Linux virtual
machines, it has it's own time change mechanism that takes affect
automatically. I've gone through many time changes in the Linux LPAR
with no repurcussions.
Ranga Nathan wrote:
On Sunday when time changes, what command can we issue to change the
clock? Or do we have to re-IPL to set the TOD? I could not see a CP
command to set TOD.
Sorry, I am relatively new to VM.
Thanks
Mike Walter wrote:
One could say the "Subject:" of this thread is "insensitive" to the
other timezones of the world! What, only Pacific Time is subject to
the new law? :-)
Being just as insensitive, I offer the following TZDATES EXEC. It
calculates the CDT/CST Timezone_Boundary values beginning in 2007,
through 2042.
Why 2042? Because it needed to stop somewhere, that's well after I
retire, and August 2042 was when the old 31-bit TOD clock wrapped.
Changing CDT/CST to your own timezone is a simple matter of XEDITing
the result file.
If I don't make the change now, while the subject is hot, it won't
happen until "too late" in 2007. There may be a better, more
efficient method, but this works, and is easily understood. I don't
expect to need to run it again until the U.S. Congress wises up,
changing to Daylight Savings Time all year around -- don't hold your
breath.
Mike Walter
Hewitt Associates
The opinions expressed herein are mine alone, not my employer's.
/* TZDATES EXEC - Get Timezone_Boundary dates for "a while"
*/ address COMMAND
resultfile='TZ BOUNDS A' 'FINIS' resultfile 'ERASE' resultfile
Do ix=2007 to 2042 /* Old TOD clock wrapped in August 2042 */
spring=GetSpring(ix) fall =GetFall(ix) 'EXECIO 1 DISKW'
resultfile '0 F 80 (STRING' spring 'EXECIO 1 DISKW' resultfile '0
F 80 (STRING' fall End 'FINIS' resultfile Exit rc
GetSpring: parse arg year . /* Find 1st Sunday in
March */ Do dx=year||0301 by 1
for 7 until dow='Sunday' dow=date('W',dx,'S') End dx=dx+7
/* Ooooh, easy date math! Add 7 for 2nd Sunday in March */
spring='Timezone_Boundary on' , date('S',dx,'S','-') ,
/* In yyyy-mm-dd fmt */ 'at 02:00:00 to CDT'
/* Change CDT as needed */ Return spring
GetFall: parse arg year . /* Find 1st Sunday in
November */ Do dx=year||1101 by 1
for 7 If date('W',dx,'S')<>'Sunday' then Iterate Return
'Timezone_Boundary on' , date('S',dx,'S','-') , /* In
yyyy-mm-dd fmt */ 'at 02:00:00 to CST' /*
Change CST as needed */ End Return
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