Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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The time information obtained from GPS signals can be set on the 
camera. The margin of error is approx. ±1 sec.
1
Check the [GPS] setting.
 
Check that [GPS] is set to [Mode 1
or [Mode 2].
2
Select [Auto time setting].
3
Select the desired setting.
 
Select [Auto update] or [Set now], 
then press <0>.
 
[Auto update] updates the time when 
the camera’s power switch is on and 
a GPS signal is received.
Setting Time from GPS on the Camera
 
If signals from at least five GPS satellites cannot be acquired, the time 
cannot be auto updated. [Set now] will be grayed out and not selectable.
 
Even if [Set now] can be selected, updating the time may not be 
possible due to an unfavorable timing of the GPS signal acquisition.
 
When [Auto time setting] is set to [Auto update], the date or time 
cannot be manually set with [52: Date/Time/Zone].
 
If you use Wireless File Transmitter WFT-E7 (Ver. 2/sold separately) and 
do not want to change the time after implementing [Sync time between 
cameras
], set [Auto time setting] to [Disable] in step 2.