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Top Forums UNIX for Advanced & Expert Users Not getting correct uptime in messages file Post 302580643 by methyl on Friday 9th of December 2011 06:26:27 AM
Old 12-09-2011
What Operating System and version do you have?

There are certainly known issues in Open Solaris if your Real Time Clock has a flat battery (or was wrong at startup) and the clock was subsequently corrected manually or corrected with NTP.
i.e. The clock changed after the kernel loaded but before System Accounting made a timestamp in the "utmp" file (which is used by the "uptime" command).
 

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SYSTEMD-TIMESYNCD.SERVICE(8)				     systemd-timesyncd.service				      SYSTEMD-TIMESYNCD.SERVICE(8)

NAME
systemd-timesyncd.service, systemd-timesyncd - Network Time Synchronization SYNOPSIS
systemd-timesyncd.service /lib/systemd/systemd-timesyncd DESCRIPTION
systemd-timesyncd is a system service that may be used to synchronize the local system clock with a remote Network Time Protocol server. It also saves the local time to disk every time the clock has been synchronized and uses this to possibly advance the system realtime clock on subsequent reboots to ensure it monotonically advances even if the system lacks a battery-buffered RTC chip. The systemd-timesyncd service specifically implements only SNTP. This minimalistic service will set the system clock for large offsets or slowly adjust it for smaller deltas. More complex use cases are not covered by systemd-timesyncd. The NTP servers contacted are determined from the global settings in timesyncd.conf(5), the per-link static settings in .network files, and the per-link dynamic settings received over DHCP. See systemd.network(5) for more details. timedatectl(1)'s set-ntp command may be used to enable and start, or disable and stop this service. FILES
/var/lib/systemd/timesync/clock This file contains the timestamp of the last successful synchronization. SEE ALSO
systemd(1), timesyncd.conf(5), systemd.network(5), systemd-networkd.service(8), timedatectl(1), localtime(5), hwclock(8) systemd 237 SYSTEMD-TIMESYNCD.SERVICE(8)
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