Time and language settings cannot be adjusted independently on a wearable device.

Connecting your wearable device to your phone will automatically sync the phone's time and language settings to the wearable.

Any changes to the phone's language, region, or time settings will sync to your wearable once the two devices are connected via Bluetooth.

HUAWEI WATCH 3/WATCH 4 Series:

• You can change the format of time display by going to Settings > System & updates > Date & time and toggling on 24 Hours.
• Time format changing is not supported in Ultra-long Battery Life mode.

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