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Sorry, I was wrong when I said to use -P
to preserve the edited FileModifyDate. (Just to be sure
you understand: FileModifyDate isn't stored in the
file -- it is a pseudo tag generated from the filesystem
timestamp for the file.) Here is a terminal transcript
showing how to shift common date/time tags plus
FileModifyDate:
> exiftool a.jpg -alldates -filemodifydate -a
Date/Time Original : 2003:09:30 13:37:51
Create Date : 2003:09:30 13:37:51
Modify Date : 2003:09:30 13:37:51
File Modification Date/Time : 2003:09:30 13:37:51
> exiftool a.jpg -alldates+=7 -filemodifydate+=7
1 image files updated
> exiftool a.jpg -alldates -filemodifydate -a
Date/Time Original : 2003:09:30 20:37:51
Create Date : 2003:09:30 20:37:51
Modify Date : 2003:09:30 20:37:51
File Modification Date/Time : 2003:09:30 20:37:51
- Phil
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