Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 518)

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Setting the Date, Time, and Time Zone
o The date, time, and time zone settings may be reset when the camera is
stored without the battery, when its battery becomes exhausted, or when
it is exposed to below freezing temperatures for a prolonged period. If this
happens, set them once again.
o After changing [Zone/Time diff erence] , check that the correct date/time are
set.
o Auto power off time may be extended while the [
5
: Date/Time/Zone] screen
is displayed.