This read-only TruthValue indicates whether both the time and the date have actually been set on the device, whether manually or via SNTP. An admin can poll it to confirm the device clock is fully initialized before trusting timestamped syslog or SNMP trap data from it, since the description notes it stays FALSE if only one of time or date was set. For example, immediately after a cold boot with SNTP still negotiating, this object would read FALSE, then flip to TRUE once the first successful sync completes.