The smart previews are in that folder. Windows allows you show the date the folder was CREATED, or the date the folder was MODIFIED, and normally these will not be the same. I believe that your column heading in the screen capture Berwerkingsdatum is the date the folder was CREATED, and not particularly relevant here.
You pointed me in the right direction!
Although "Lightroom Master Catalog Smart Previews.lrdata" appears to be a Folder on Windows, on Mac it just appears as one of those "Items" which look like a file (see first screenshot) but underneath, it's a Folder, See the screenshot from the Finder below:
Watch the "d" at the beginning of the line.
What still is a little confusing though is that the "Lightroom Master Catalog Previews.lrdata" DOES change its modification timestamp. But my guess is this one not only contains additional sub-folders, but also files and when these might be recreated, the master folder's timestamp is modified.
So I guess my confusion is solved
Well I'm glad you have an answer, although I can't understand what looking on MAC file system has to do with this.
The first screenshot shows my Mac's filesystem where all of the related info is visible.
Folders and regular files as well as the NOT changing timestamp of the "Lightroom Master Catalog Smart Previews.lrdata" which is an item that looks like a regular File but in fact is a Folder.
Reason for looking in there was that I was searching for large files that could be removed to free disk space.
While doing so I ran into the Lightroom Catalog Preview related ones and then it confused me that one of them did not have a recent timestamp.
The solution I gave applies even if you have never owned a Mac.
Yes, I do agree that your solution works on all platforms.
Revisiting your original post, I came to the conclusion that you made a wrong assumption in translating "Bewerkingsdatum". Dat in fact is the MODIFICATION timestamp.
So for completeness, I do have the other ones as well, except not shown:
- Bewerkingsdatum = Modification
- Aanmaakdatum = Create
- Openingsdatum = Open
- Toevoegingsdatum = Added
In that light, it does make a difference between Mac and Windows. Not specifically because of where the Smart Previews are stored, but how that item is shown.
Items like the "Lightroom Catalog Smart Previews.lrdata" are shown as a "Folder" on Windows, but as some kind of a regular file on MacOS. So be it, this lesson will stay with me, so thanks for that
To figure out where the non-adjustment of the MODIFICATION timestamp comes from, one has to dig into how Folders and Files are treated when being used. I figured it out but I won't go into the details here as that comes down to Operating System Architecture details and is off-topic here.
However, if one does want to know a little more, look at the explanation I gave in my initial response to your valid solution.
For me, this case is now closed.
Thanks for the info provided!