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

--- Comment #19 from MarcP <iwannaber...@gmail.com> ---
In any case, according to that conversion table: 

Exif.Image.DateTime         <=>      Xmp.xmp.ModifyDate

That means that the Exif.Image.DateTime, that is used in digikam as the date
for when the "picture was taken" and currently syncs with Xmp.xmp.CreateDate is
indeed a "last modification date", and it's used like that in most pictures
managers. That field will be overwritten as soon as a picture is edited, so
that field should not be used to store permanent data.

The other equivalency: 

Exif.Photo.DateTimeOriginal   <=>   Xmp.photoshop.DateCreated 

is a bit weird. But in any case, that speaks against the use of
Xmp.xmp.CreateDate in digikam and use Xmp.photoshop.DateCreated instead.
Actually, that is the case for Adobe Lightroom, Adobe Photoshop, and ACDSee.
However, Xmp.exif.DateTimeOriginal is the preferred field for that information
in Picasa, ACDSee, and Shotwell. For some reason, Microsoft Photos just uses
the xmp.xmp.createdate field instead, like Digikam (and also Shotwell, but not
exclusively).


(Oh, and more argument for the use of Exif.Photo.DateTimeOriginal as the main
"Date taken" field in Exif, is that most (if not all) cameras store the date in
that field, while not using any kind of XMP information.

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