There is a clock builtin in the Lufft I-BOX. This clock is as accurate as the quartz crystal oscillator used. If your Lufft I-BOX needs more accurate time and date settings e.g. for time reference there is a new app for that. Using the App timesync synchronizes the internal clock once a day with an external (ntp) timeserver. Just install this app, configure the time server and the clock is always accurate.