@Tapio
For android
https://play.google.com/store/apps/details?id=eu.duong.imagedatefixer
And/or
https://play.google.com/store/apps/details?id=eu.duong.picturemanager
My current photo work flow is :
Take photos with my smartphone but without localisation.
Modifiy them if needed, then export gpx of my activities, and use second app to geotag my pictures thanks to gpx timestamps vs exif taken one.
And cherry on the cake, file modification date is setup again to exif taken date.
Lots of possibilities.
For android
https://play.google.com/store/apps/details?id=eu.duong.imagedatefixer
And/or
https://play.google.com/store/apps/details?id=eu.duong.picturemanager
My current photo work flow is :
Take photos with my smartphone but without localisation.
Modifiy them if needed, then export gpx of my activities, and use second app to geotag my pictures thanks to gpx timestamps vs exif taken one.
And cherry on the cake, file modification date is setup again to exif taken date.
Lots of possibilities.

