What Lazarus version do you have?
Version 2.2.6 installed October of last year.
Usually when time changes, if I have Lazarus open, then I am warned only about my files, not packages (if I remember correctly).
The screenshot here shows a package version change, and you can just barely see a more substantive change in a comment. There were more than just .lpk files in this batch, and while most of the changes were minor package version numbers, there were other more substantive ones.
It doesn't happen often, but it happens more than just with time changes. It is always when Lazarus has been left running, and so far has always been when I have been away from the computer (never when I've triggered a build or have interacted with Lazarus in some way). All the changes this time around were inside the Lazarus tree. Not all of them in components, some were in the LCL source itself.
I wish I had recorded the changes more faithfully, but I figured it would be a well-known setting that someone could identify.