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jhead(1), the "Exif Jpeg header manipulation tool". This thing is pretty useful when you need to take some Exif data from your photos and use it to rename those files for example.
Just as usual:
$ sudo apt-get install jhead-
Rename files using its timestamps:
$ jhead -n%Y%m%d_%H%M%S *.jpg -
Tweak the timestamps itself (if you forgot to set up the timezone for your camera):
$ jhead -ta+5:00 *.jpg