__pmMktime is very similar to mktime(3), except the timezone used is
the current ``reporting timezone'' (rather than the default TZ
environment variable scheme).
Like mktime(3) the time to be converted is passed via timeptr, and
the function result contains the calendar time (the number of seconds
since 00:00:00 UTC, January 1, 1970).
The default current reporting timezone is as defined by the TZ
environment variable, so __pmMktime and mktime(3) will initially
produce similar conversions.
Use pmNewZone(3), pmNewContextZone(3) or pmUseZone(3) to establish a
new current reporting timezone that will effect __pmMktime but not
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Performance Co-Pilot PCP PMMKTIME(3)