"the day it was actually saved/written as bits onto my hard drive"
Yes, clearly. IT WAS NOT ALWAYS THE CASE.
Once you copy a file (which has NOT even been modified) a couple of times or restore it to a new hard drive, the dates all become meaningless.
I have 10s of 1000s of files restored to my computer. All the dates have been ruined. SO FRUSTRATING.
Microsoft CHANGED what the dates shown in File Explorer mean. (With Windows 7?) It was quite noticeable. It used to actually be meaningful. And they apparently changed how it worked for their own benefit (or out of sloppiness or whatever) but not for the benefit of the user.
HOW CAN I MAKE FILE EXPLORER SHOW A USEFUL DATE FIELD? (So that I can sort on that field)
This has been particularly evident with PHOTOS. DISPLAY THE DATE IT WAS TAKEN (or photo-edited) for crying out loud.