To set the phone to show the current time in standby mode, adjust the time, and
select the 12-hour or 24-hour time format. If the battery was removed from the
phone, you may need to set the time again.
To set the correct date. If the battery was removed from the phone, you may need
to set the date again.
Auto update of date & time
This Network Service updates the date and time according to the current time
zone. The automatic update of date and time does not change the time you have
set for the alarm clock or the reminder notes. They are in local time. Updating may
cause some alarms that you have set to expire.