Hello,
digikam currently supports two date based methods for sorting images in the view. Creation date and Modification date. I do not actually know, but I guess these are just the filesystem dates of each image.
With digikam being a photo management software and all, I would like the Recording date (as stored by the camera itself) to be added as an additional option. This date should be read from the meta data and not from the filesystem. In cases there is no recording date in the meta data, the filesystem Creation date may be used instead.