Use test jpg photos with a valid exif date taken.
Test 0)
"Edit XMP" dialog handles xmp dates correctly :
When XnViewMP creates a sidecar with Edit XMP dialog, the sidecar will contain
- Xmp Create date, filled with Exif Date taken
- Xmp Modify date, filled with current date/time
Ok
If we use again "Edit XMP", Xmp Modify date will be updated. Ok
Test 1)
Then, if we use Categories to add xmp keywords for the same photo, xmp dates are not updated :
- Xmp Modify date stays unchanged (bug 01)
Test 2)
On a new photo, if Categories are used first to create the sidecar, these dates are not writen (bug 02)
Test 3)
Then, for the same photo, if we add a metadata with "Edit XMP" , these dates will be created, but they are both filled with current date, instead of using exif date taken for the xmp create date (bug03)
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Embedded XMP only
Now, repeat same tests without sidecar, so :
- Without "create sidecar" setting.
- Settings Metadata : "Export catalog ..." and "Create xmp" are enabled , and "Write categories as keywords" too.
Bug01 is still present: categories does not update xmp modify date.
Bug02 is still present : categories does not create xmp dates
Bug03 has disappeared : when xmp metadata already exist, "Edit XMP" is able to create xmp dates and use exif:date taken for xmp create date
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Edit 2024 Sept 08
Other Information:
The first choice used for xmp create date is : exif date taken
When exif date taken is missing, XnViewMP uses exif date modified.
If exif date modified is also missing, XnViewMP doesn't use exif date digitized (why not ?) , current timestamp is used instead.
In "Edit IPTC" dialog, we can edit "created date/time" and "released date/time" , which I don't think is used much anymore (except by using Mode=xmp only, to handle xmp:photoshop dates
)But, in "Edit XMP", there is no place to edit the two xmp dates we are talking about, even though these dates are used by XnViewMP.
Related
See also this thread viewtopic.php?f=82&t=47710 where Psycik tries to use xmp dates (or xmp-photoshop dates ?) in combination with Immich App, which is quite the only way to use metadata on Android (with FastPhotoTagger App)