How to get Android system boot time

问题

How can I get the absolute system boot time within the shell? i tried cat/proc/uptime, but this only returns the time since reboot.

回答1:

It's basically:

java.lang.System.currentTimeMillis() - android.os.SystemClock.elapsedRealtime();

来源：https://stackoverflow.com/questions/15342301/how-to-get-android-system-boot-time