Hello,
For quite some time I have been using a Windows application called GeoSetter which can add the time zone offset information to photos' date metadata (XMP dates). It has a simple functionality which uses a photo's date and location (lat and long coordinates) to determine the applicable time zone for that photo. If location information is not available, the user can add this information manually. Having Digikam already supporting time zone metadata, it would be useful to have similar functionality as this information is quite useful for geotagging purposes.
Also, as the latest EXIF standard finally includes fields for time zone offset it would be useful to add this information to the EXIF date dialog in the Edit Metadata functionality given that for XMP dates it is already supported.
EXIF 2.32 Time Zone fields:
0x9010 OffsetTime string ExifIFD (time zone for ModifyDate)
0x9011 OffsetTimeOriginal string ExifIFD (time zone for DateTimeOriginal)
0x9012 OffsetTimeDigitized string ExifIFD (time zone for CreateDate)
At least my Pixel 3 phone adds this information already when photos are taken.
- J Oliver
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