Strategy when creation date or tag is not correct

[mrm]

Scanned images are pesky: I have boxes of undated prints and negatives, and most aren’t dated: that’s a task I haven’t tackled yet.

Edit: more details for this issue is here:

How to handle scanned images?

I just had a user ask I have many source photos scanned from slides and printed photos. These all have no meta data, and file creation dates far in the future of when the photo was taken. What should I do with these files to ensure PS can sort them correctly by date? Do I have to add meta data, or change the file creation time, or something else? Many thanks in advance. How PhotoStructure pulls out captured-at PhotoStructure has a bunch of heuristics to try to pull in a “captured-at” date …