Date Created v Date Taken?

Discussion in 'Digital Cameras' started by Terry Pinnell, Mar 21, 2005.

  1. I'm confused about interpreting these two date/time entries, for
    photos that have EXIF data. For example, in a Windows folder, I see
    that a set of photos have inconsistent time entries, as in the
    following example:
    Date Created = 04/05/2003 10:33
    Date Picture Taken = 04/05/2003 11:33

    Exactly the same 1 hour difference is seen for photos in August in
    another folder. Yet my Sony DSC-1 Cybershot has no provision for
    summer time, and my WinXP PC automatically updates the time when
    necessary, so why is that arising?

    One I've just taken today shows identical times. We're still in GMT,
    so presumably it is definitely a 'summertime/GMT' issue/

    In yet another case the Date Created is wildly different, taking the
    same value as the date it was modified (i.e, presumably edited,
    without loss of EXIF data):
    Modified = 29/12/2003 16:06
    Created = 29/12/2003 16:06
    Taken = 23/12/2003 18:15

    Could someone kindly clarify the rules please?
    Terry Pinnell, Mar 21, 2005
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  2. Thanks Julian. I think the explanation for the 1 hour is simply that I
    must have failed to alter the time on my camera. So in May and August
    the camera was still reading GMT, an hour behind Summer Time.

    But that leaves the more confusing issue: what exactly does Date
    Created mean? Intuitively I'd have thought as you do, but from the
    other example I gave, and there are many more, it plainly does *not*
    mean the same as Date Picture Taken (plus or minus an hour for
    daylight saving variations). And neither is it consistently the
    date/time when the file first met up with Windows.

    I've just experimented a bit more with the photo I took yesterday,
    21st March at 13:11. Even after resizing it to 50% and sharpening
    (both in IrfanView), its Created and Modified dates remain unchanged.
    Why? Yet making a Copy changed the Created date, as I'd expect, but
    not the Modified date. So that yields the illogical situation of a
    file that was modified before it was created!

    Modified Created Taken
    Frog.JPG 21/03/2005 13:11 21/03/2005 13:11 21/03/2005 13:11 Edited
    Frg2.JPG 21/03/2005 13:11 22/03/2005 11:22 21/03/2005 13:11 Copied

    Musing over these examples, the best I can come up with is this:

    "Date Created = Date Taken (as recorded by camera), except that if it
    is subsequently ever copied, the Date Created becomes the date of
    copying. However, no degree of editing or moving will alter the date."

    Does that match others' experience please?
    Terry Pinnell, Mar 22, 2005
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  3. I've changed my mind - that cannot explain it! When I took the photo
    the camera presumably recorded the Date Picture Taken as 04/05/2003
    11:33 (4th May). At some later date I moved it to my HD and WinXP
    recorded Date Created as 04/05/2003 10:33. But why that hour's
    difference? Obviously Windows cannot know whether or not my camera had
    been set to the correct time when the photo was taken! Why didn't
    Windows simply enter Date Created = Date Picture Taken = 11:33

    BTW, if (as I'm pretty sure was the case) I had not manually moved the
    camera's clock one hour forward to match Summer Time (around end
    March, early April), then that Picture Taken time of 11:33 was
    incorrect, and should have been 12:33 (not 10:33).
    Terry Pinnell, Mar 22, 2005
  4. Be aware that the NTFS and CDFS store the time in UTC and present it as
    clock time, but FAT simple storeds Clock time, and has no concept of time

    David J Taylor, Mar 22, 2005
  5. Terry Pinnell

    ASAAR Guest

    If you used a card reader to transfer the pictures, there's no
    reason I can think of why there would be that one hour difference.
    But if you used any of Sony's software to transfer the pictures from
    the DSC-1, it might have detected the one hour discrepancy between
    the camera's and the computer's time, and compensated by adjusting
    the creation date by one hour.
    ASAAR, Mar 22, 2005
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