Canon EOS 5D Mark III Instruction Manual page 240

3 Setting the Time Code
Movie Recording Count
You can select what to display on the movie-shooting screen.
[Rec time] : Indicates the elapsed time from the start of the movie
[Time code] : Indicates the time code during movie shooting.
Shooting still photos during movie shooting will cause a discrepancy
between the actual time and time code.
Regardless of the [Movie rec count] setting, the time code will always be
recorded to the movie file.
Movie Playback Count
You can select what to display on the movie playback screen.
[Rec time] : Displays the recording time and playback time during
[Time code] : Displays the time code during movie playback.
With [Time code] set:
During movie shooting
If you change the setting for either [Movie play count] in [z5 (movie):
Time code] or for [x3: Movie play count], the other setting will also
change automatically.
"Frames" are not displayed during movie shooting and movie playback.
240
shooting.
movie playback.
During movie playback