The local date and time of the last SNTP request or
unsolicited SNTP message for this SNTP client since agent
reboot. Essentially, this value is a timestamp for the
etsysSntpClientLastAttemptStatus object. When the
etsysSntpClientLastAttemptStatus has a value of success(2),
this object's value should be equal to the value returned by
etsysSntpClientLastUpdateTime. If no SNTP frames have been
processed by the SNTP client then this value MUST return
'00000000'H. This object is updated for all non-disabled
operational modes of the SNTP client.