03-14-2017
Could it also be (given that you don't show any errors) that the timezone gets in the way? The real time is stored in UTC/ZULU/CUT/GMT and it is compensated for by the timezone setting in $TZ before it is displayed.
Is it that the time is set okay, but when you display it there is a discrepancy because of your timezone?
Of course, NTP might be getting in and re-setting the clock too. Typically this is done at boot time as a big step.
Robin
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LEARN ABOUT CENTOS
pmlocaltime
PMLOCALTIME(3) Library Functions Manual PMLOCALTIME(3)
NAME
pmLocaltime - convert the date and time for a reporting timezone
C SYNOPSIS
#include <time.h>
#include <pcp/pmapi.h>
struct tm *pmLocaltime(const time_t *clock, struct tm *result);
cc ... -lpcp
DESCRIPTION
pmLocaltime is very similar to localtime(3), except the timezone used is the current ``reporting timezone'' (rather than the default TZ
environment variable scheme), and the result is returned into a caller-declared buffer (rather than a private buffer).
Like localtime(3) the time to be converted is passed via clock, and the result contains the components broken out in the elements of the tm
struct.
pmLocaltime returns result as the value of the function.
The default current reporting timezone is as defined by the TZ environment variable, so pmLocaltime and localtime(3) will initially produce
a similar encoding of the date and time.
Use pmNewZone(3), pmNewContextZone(3) or pmUseZone(3) to establish a new current reporting timezone that will affect pmLocaltime but not
localtime(3).
SEE ALSO
localtime(3), PMAPI(3), pmCtime(3), pmGetConfig(3), pmNewContextZone(3), pmNewZone(3), pmUseZone(3), pcp.conf(5) and pcp.env(5).
Performance Co-Pilot PCP PMLOCALTIME(3)