Using makernotes TimeZone tag to generate GPSDateStamp and GPSTimeStamp?

[mathew22223]

My Canon camera puts the offset from UTC in the TimeZone tag. Is there an easy way to write GPSDateStamp and GPSTimeStamp tags, calculated from DateTimeOriginal and TimeZone, whether or not there is already GPS location info in the metadata?

I've looked at some previous threads (this one, this one, and this one) but they aren't talking about exactly what I'm looking for.

[Phil Harvey]

Try this:

exiftool "-gpstimestamp<$datetimeoriginal$timezone" "-gpsdatestamp<$datetimeoriginal$timezone" DIR

This works due to some ExifTool magic (explained in the GPS Tag Name documentation).

- Phil

[mathew22223]

Thanks! That does exactly what I want.