"Date Modified" changed format with additional info

[hannes_hab]

How can I prevent Imatch from changing the Format of XMP::xmp\ModifyDate\ModifyDate\0 ?
Original : 27.08.2021 | 15:05:06
After editing and write back: Heute um 09:16:00 +02:00

I would like to leave that unchanged.
It leads to wrong behavior in my raw converter when mapping the date (should be the date I took the picture without additional info) to the picture.

[Mario]

This filed must be updated when XMP metadata is written/changed.

[hannes_hab]

Thank you.
I dont know what happens, but changes in Imatch did not help - the field was updated and seemed to look right but no changes in the raw converter (still funny date shown) - but changing the date/time for a second in After Shot Pro helped.

[Mario]

I'm not sure that I can follow.

The format for date and time in XMP is standardized and ExifTool updates it during the write-back process in IMatch (like several other timestamps, required digest data etc.).
No application should have any problems when the XMP modify date changes - instead they should update their internal "metadata cache" when they notice a changes in this timestamp, one of the digests/checksums or the last modified on disk timestamp. Probable the developers of your RAW software should check if they have considered that correctly.