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You can set your phone to update the time, date, and time zone automatically. Automatic update is a network service and may not be available depending on your region or network service provider.
Tap Settings > System > Date & time.
Switch Use network-provided time on.
Switch Use network-provided time zone on.
Change the clock to the 24-hour format
Tap Settings > System > Date & time, and switch Use 24-hour format on.