https://bugs.kde.org/show_bug.cgi?id=420710

--- Comment #17 from Stefan <thaqe9rd...@temp.mailbox.org> ---
(In reply to MarcP from comment #16)
> Hi. Now that the final 7.0.0 version has been released, can we have a look
> at this report? 
> 
> I think the samples I provided show that the main tag for saving the date in
> Exif is  the Exif.Photo.DateTimeOriginal. To sum up, I believe it should be
> like this:
> 
> Exif.Image.DateTime = Xmp.xmp.ModifyDate
> Exif.Photo.DateTimeOriginal = Xmp.xmp.CreateDate
> 
> PS: curiously enough, Photoshop is the outlier here, as it's just a photo
> editor not a picture library manager, and just saves the date to xmp and
> iptc.

(Deepl translates)
I interpret the definitions more like this:

Exif.Photo.DateTimeOriginal = Xmp.photoshop.DateCreated  
= Exif.Image.DateTime 
-> creation date of the displayed image ("what you see")

Exif.Photo.DateTimeDigitized = Xmp.xmp.CreateDate 
-> Digitization date (= creation date of the digital image, not the creation
date of the real photo (e.g. the scan image of a negative)

xmp:ModifyDate 
-> Date of the last change of the image (?)

xmp:MetadataDate 
-> Date of the last change of metadata (?)

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