There is a particular tag on images from an iPhone called RunTimeValue that is part of the Apple tags when listed with exiftool:
exiftool -s -a -G1 -struct .\myimage.jpg
...
[Apple] RunTimeFlags : Valid
[Apple] RunTimeValue : 2619022239416
[Apple] RunTimeScale : 1000000000
[Apple] RunTimeEpoch : 0
...
[Composite] RunTimeSincePowerUp : 0:43:39
The exiftool documentation states that neither this tag nor the RunTimeSincePowerUp tag are writeable.
Any idea on how I can edit both these to a new value?