When I restart the Asus Tinkerboard R by unplugging power, the clock is set to build time, and there it remains.
The log says
2017-08-05 11:00:19.785 521-521/system_process I/AlarmManager: Current time only 1501923619785, advancing to build time 1598248575000
2020-08-24 07:56:15.005 521-521/system_process D/SystemServerTiming: StartAlarmManagerService took to complete: 12ms
... but the correct datetime is never set.
When I reboot the system by adb reboot, the time will be set correctly.
Why is this so?