This template will categorize into Category:Wikipedia files with unknown source.
Syntax
{{di-no source|non-free={yes|no}}}

The non-free parameter should be set to "yes" if the image is licensed under a fair use claim. This will set the date two days in advance rather than seven. Keep in mind, however, that under WP:NFCC, the uploader must be notified if that is the case.