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