My Huawei p9 mobile phone, with time switch machine, can be turned on or off.

the setting path of time switch machine is:

EMUI 3.1: setting? > ? All settings? > ? Intelligent assistance? > ? More? > Time switch machine.

EMUI 4.X & 5.X & 8.X & 9.X: settings? > ? Intelligent assistance? > ? Time switch machine.

turn on the switch, and you can set the time and repetition frequency of timing startup or shutdown.

Note:

If there is no time switch machine option in the setting path, time switch machine function is not supported.

the off switch and the on switch are separate and need to be activated separately.