RTC Usage

The AIO-1688JD4 development board has an RTC (Real Time Clock) chip
"TT8563RH", which can be used to set the system clock.

Here are common RTC operations:

   # View RTC time
   $ sudo hwclock
   2024-05-09 10:53:15.268874+0800

   # View system time
   $ date
   Tue May  9 10:57:03 CST 2024

   # Set system time to RTC time
   $ sudo hwclock -s

   # Save current system time to RTC
   $ sudo hwclock -w