At 18:45 +0100 on 03/13/2009, SCHARITZER Gerald wrote about Re: Time
Change (Sync):
In the "z/OS MVS world" the time zone is stored in CVTLDTO, which only
contains the UTC offset. This makes life easy for the TIME macro, which
simply adds the offset to UTC to obtain local time. However, CVTLDTO
does not remain constant throughout the year. Switching to and from DST
literally means to modify CVTLDTO accordingly.
In order to keep z/OS UNIX and z/OS MVS local time in sync, CVTLDTO must
be adjusted at exactly those points in time, when the DST algorithm of
TZ kicks in.
Since the time change only needs to occur twice a year, it should not
be that hard to have a started task running that will update CVTLDTO
when 2AM on a switch morning occurs. The task is fired off at
midnight on a switch day and then waits for 120 minutes to do its
thing and exit.
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