If I time-shift the original and  the rotated image with Phatch (and attached 
command list:  exif time shifting by +1 hour), the original image will be OK, 
but the rotated image will get as resulting exif time, not something based on 
the exif time, but one the file time.
In my example, it results in 10/09/2011 11:23:11 for rotated image (instead of 
correct result of 21/05/2010 10:10:36 for original image after time shifting).

I guess that whatever modification (or even e-mail sending!) is done on
an image, the file time becomes different from the exif time, and
unfortunately Phatch seems to only use file time as input, not exif
time.

** Attachment added: "Phatch command list to shift exif time by 1h"
   
https://bugs.launchpad.net/ubuntu/+source/phatch/+bug/841701/+attachment/2380966/+files/shift_1_hour.phatch

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https://bugs.launchpad.net/bugs/841701

Title:
  Bad date/time for rotated images

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