Overview for System Clock
The system clock can be implemented in two ways. One is to automatically synchronize the time from the Simple Network Time Protocol (SNTP) server as the SNTP client, and the other can be configured by the administrator.
The system clock is divided into hardware clock and software clock. After configuring the system time manually, restart the device. If the default time is restored after restarting, it means that the hardware clock is not supported and only the software clock is supported.