Date and time
To change the clock type, time, time zone, and date settings, select Menu > Settings >
Time and date > Time, Date, or Auto-update of date & time (network service).
When traveling to a different time zone, select Menu > Settings > Time and date >
Time > Time zone and the time zone of your location in terms of the time difference
with respect to Greenwich mean time (GMT) or coordinated universal time (UTC). The
time and date are set according to the time zone and enable your device to display the
correct sending time of received text or multimedia messages.
For example, GMT -5 denotes the time zone for New York (USA), 5 hours west of
Greenwich/London (UK).