Exif.Image.DateTime is the more correct date for when the image itself was
generated.
I've just checked that and found this explanation to be correct.
But nevertheless, Gimp rewrites some other EXIF-Information it rather
shouldn't, like Fnumber. Identifying the orignal photo with ImageMagick
identify -format "%[Exif:fnumber]" photo.jpg
yields e.g. 37/10, whereas the same command on the Gimp JPEG export
yields f/3.7. I admit that's smarter, but has to be dealt with in my
script. There are a few other data entries which are also deleted or
modified.
When modifiying a JPEG image, Gimp should restrict rewriting of EXIF
entries to those that have really been altered.
Wolfgang Hugemann
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