Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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When you turn on the power for the first time or if the date/time has 
been reset, the Date/Time/Zone setting screen will appear. Follow steps 
3 to 6 to set the current date, time, and time zone.
Note that the date/time appended to recorded images will be based 
on this date/time setting. Be sure to set the correct date/time.
You can also set the time zone of your current address. Then if you 
travel to another time zone, you can simply set your destination’s time 
zone so that the correct date/time will be recorded.
1
Display the menu screen.
 
Press the <M> button to display 
the menu screen.
2
Under the [52] tab, select [Date/
Time/Zone].
 
Press the <Q> button and select the 
[5] tab.
 
Turn the <6> dial to select the [52
tab.
 
Turn the <5> dial to select [Date/
Time/Zone
], then press <
0>.
3
Set the time zone.
 
[London] is set by default.
 
Turn the <5> dial to select [Time 
zone
].
 
Press <
0> so <r> is displayed.
 
Turn the <5> dial to select the time 
zone, then press <
0>.
3
 Setting the Date, Time, and Zone