Setting The Date and Time
Your device automatically sets the date and time using network-provided values. You can also set the time manually and display it in 12–hour or 24-hour formats.
1. Open 
Settings.
2. Touch Advanced settings > Date & time. You can:
– Set the time and date automatically using network-provided values: Switch on Automatic date & time.
– Set the time zone automatically using network-provided values: Switch on Automatic time zone.
– Set time format: Switch on the 24–hour format to display the time in 24–hour format. By default, the time is displayed in 12–hour format.
Questions about your Huawei Mate 10? Post in the comments!
Huawei Mate 10 Manual [PDF]