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I have a lot of photos, taken during our last holiday, but I forgot to set the right timezone. I had a look to exiftool, and I could change the EXIF standard date times with this command exiftool -AllDates-=6 ., to substract 6 hours from the originale dates, to

Modify Date                     : 2013:09:03 13:12:33
Date/Time Original              : 2013:09:03 13:12:33
Create Date                     : 2013:09:03 13:12:33

This worked fine. But one problem is, that the file attributes

File Modification Date/Time     : 2013:10:28 19:39:58+01:00
File Access Date/Time           : 2013:10:28 19:39:58+01:00
File Inode Change Date/Time     : 2013:10:28 19:39:58+01:00

should also be changed to the times in Modify Date, and not to the current time of my laptop. Another thing is, that my camera put some "special" tags into the exif information, like

Sony Date Time                  : 2013:09:03 19:12:33
GPS Time Stamp                  : 17:39:32
GPS Date/Time                   : 2013:09:03 17:39:32Z
GPS Date Stamp                  : 2013:09:03

and this information isn't changed by exiftool. I'm not sure which of that attributes really matter, but if it's possible, I would like to change them as well.

One problem that I can imagine is with the GPS Date Stamp: 2013:09:03 tag. When substracting 6 hours of a certain date, the pictures date could be yesterday. And I'm not sure if this can be solved. Or which program does use this attributes?

Thx, tux

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