Time and language cannot be set on your wearable device.

Once the wearable device is connected to a phone, the time and language settings on the phone will automatically sync to the wearable device.

If you change the language, region, or time on your phone, the changes will automatically sync to the wearable device as long as it is connected to your phone via Bluetooth.

If you are using the HUAWEI WATCH 3/4 Series: Go to Settings > System & updates > Date & time, and toggle on the switch for 24 Hours to change the format of the time display.

Reference: [HUAWEI] The time on my watch/band is different form that on my phone.