Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual page 37

If you store the camera without the battery or if the camera's battery
becomes exhausted, the time zone and date/time may be reset. If this
happens, set the time zone and date/time again.
The date/time that was set will start from when you press <0> in step 5.
After changing the time zone, check that the correct date/time has been set.
You can also set the daylight saving time with [52: Time zone].
The [52: Time zone] and [52: Date/Time] daylight saving time settings
are linked.
3 Setting the Date, Time, and Time Zone
Set the date and time.
3
Press the <U> key to select the
date or time number.
Press <0> so <a> is displayed.
Press the <V> key to set the
number, then press <0>. (Returns
to <b>.)
Set the daylight saving time.
4
Set it if necessary.
Press the <U> key to select [Y].
Press <0> so <a> is displayed.
Press the <V> key to select [Z],
then press <0>.
When the daylight saving time is set
to [Z], the time set in step 3 will
advance by 1 hour. If [Y] is set, the
daylight saving time will be canceled
and the time will go back by 1 hour.
Exit the setting.
5
Press the <U> key to select [OK],
then press <0>.
The date/time and daylight saving
time will be set and the menu will
reappear.
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