John,
That information is correct, but if you are digging to the full depth,
in Windows, in the NTFS, there are 4 dates pertaining to the file:
("MACE") "Create", "Modify", "Access", and "Entry Modified".
(Ref: http://forensicswiki.org/wiki/New_Technology_File_System_(NTFS) )
Different file systems (DOS) have different structure.
All these are separate from Exif, which is written inside the file and is
system-independent.
The timestamp that is typically changed by Windows programs (including
FastStone Image Viewer) is "Modified".
Which time is reported - depends on the program, and could depend on the
view/mode.
E.g. under "File Explorer" in Win 10 (aka Windows Explorer in Win 7 and
before), in "details" view, you can right-click on the header of any of
the columns and choose which columns will be shown. Those include:
"Date" (enabled by default), "Date Created", "Date Modified", "Date
taken".
The latter three are self-descriptive. The last one is taken from Exif.
The first one, I suspect is "adaptive", - i.e. depends on the type of the
file. I see that for images, the first one is taken from "Data taken"
(taken from Exif), at least in the default configuration (It might be
possible to modify that behavior).
You can also right-click on the file in that same File Viewer, and select
"Properties". Then you'll see all three dates "Created", "Modified",
"Accessed" right there.
And then, if you click on "details" tab (still in that "properties"
pop-up), you can see some details from EXIF, including the date.
HTH,
Igor
John Francis Wed, 08 Mar 2017 10:01:28 -0800 wrote:
On Tue, Mar 07, 2017 at 11:01:37PM -0500, John Sessoms wrote:
When you say "set the file timestamp to the same (as EXIF) date/time" do
you mean that the file date Windoze displays will be the same as the
EXIF date/time?
A little more than that ...
Some versions of Windows apparently already display the EXIF date/time
for JPEgs - something that caused me a certain amount of confusion when
I couldn't understand why a piece of my code (which used the timestamp
stored in the filesystem) showed different details for two copies of a
file even though folder display on my Windows system showed them as the
same date/time (the timestamps differed by an hour because of a bug in
the way certain versions of Windows apply DST to file timestamps when
they're copying files, but that's a whole different can of worms).
Setting the actual timestamp stored in the file system to match the EXIF
date/time means, in theory, that your file system information now matches
what was (or should have been ...) associated with the file when your
camera initially created the image. But unfortunately it's a whole lot
more complicated than that. There are generally at least two timestamps
associated with a file - one showing the time the file was created, and
one showing the time the contents were last modified. These start off
the same, but they don't always stay that way. And, very confusingly,
when you make a copy of a file, the way the timestamps on the new copy
get set can be different depending on what software you are using . . .
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