[vox-tech] .jpg Mystery

[Rod Roark]

On 01/21/2010 11:18 AM, Bill Kendrick wrote:
> On Thu, Jan 21, 2010 at 10:35:35AM -0800, Bob Scofield wrote:
>> In Linux there are a couple of different ways I can get the date and time the 
>> photo was taken.
> 
> I picked a random photo I took with a Canon digital camera a few years ago.
> The date/timestamp of the file on my laptop was from 9:05pm on the day
> the photo was taken.
> 
> However, using "File->Properties..." in Gwenview, and looking at the
> metadata stored in the file itself, it was stamped as 8:05pm of that day.
> 
> I'm guessing the timestamp in the metadata is off by an hour because
> I never adjusted the clock inside my camera to account for Daylight Savings
> time change.  (In other words, the camera THOUGHT it was 8:05pm, so that's
> the metadata it stored.)

I would think that the file's timestamp is derived from the time set in 
the camera, one way or another.  Either the camera creates the file on a 
standard (probably win32) filesystem when the picture is taken, or the 
timestamp is assigned from the metadata by some special software that 
fetches images to your computer from the camera.

Sounds like some sort of bug to me, perhaps where some piece of software 
neglects to take DST into account.

Rod