Check manual page of systemtime
Synchronization of operating system time
This check is a simple check of the correct setting of the current
system time of the target host. It simply compares the local time
on the monitoring server with that measured by the agent on the
target host. It is not very accurate since it does not account for
the systematic time delay between the output of the time by the agent
and the actual processing of that data by Check_MK.
Its advantage - however - is that it works on any Windows host (with
an agent of version of 1.1.10 or later) - regardless of the method used
to synchronize the time.
Levels can be set for making the check warn/crit if the time difference
exceeds the configured limits.
One service will be created for each host supporting this check.
Currently this is the windows agent in version 1.1.10 or later.