System Time within the Dlink router is the total time that displays the duration for which the router is working. The feature is also utilized in other time-based control features like Parental Control that plays a vital role in limiting the duration for which the Wi-Fi within the network is used. You can also enable the System time of the dlinkrouter.local window through by 24-Hour time function in which you want the time to be displayed for 24 hours.