Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 222)

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The time information obtained from GPS signals can be set in the
camera. The margin of error is approx. ±0.02 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 is turned 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 [ 5 2: Date/Time/Zone ].
If you use Wireless File Transmitter WFT-E8 (sold separately) or WFT-
E6 (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.