The date and time of the system, specified in local time. Only a community name having 'admin' priviledges will be allowed to modify this value. Although any valid community name is allowed to read it. If an NTP server has been configured in zhoneSntpConfiguration, then manual setting of the date and time is not allowed, and a set attempt on zhoneSystemConfigurationDateAndTime will result in a generic error.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)