<br><br><div class="gmail_quote">On Thu, Jan 21, 2010 at 11:41 AM, Rod Roark <span dir="ltr"><<a href="mailto:rod@sunsetsystems.com">rod@sunsetsystems.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On 01/21/2010 11:18 AM, Bill Kendrick wrote:<br>
> On Thu, Jan 21, 2010 at 10:35:35AM -0800, Bob Scofield wrote:<br>
>> In Linux there are a couple of different ways I can get the date and time the<br>
>> photo was taken.<br>
><br>
> I picked a random photo I took with a Canon digital camera a few years ago.<br>
> The date/timestamp of the file on my laptop was from 9:05pm on the day<br>
> the photo was taken.<br>
><br>
> However, using "File->Properties..." in Gwenview, and looking at the<br>
> metadata stored in the file itself, it was stamped as 8:05pm of that day.<br>
><br>
> I'm guessing the timestamp in the metadata is off by an hour because<br>
> I never adjusted the clock inside my camera to account for Daylight Savings<br>
> time change. (In other words, the camera THOUGHT it was 8:05pm, so that's<br>
> the metadata it stored.)<br>
<br>
</div>I would think that the file's timestamp is derived from the time set in<br>
the camera, one way or another. Either the camera creates the file on a<br>
standard (probably win32) filesystem when the picture is taken, or the<br>
timestamp is assigned from the metadata by some special software that<br>
fetches images to your computer from the camera.<br>
<br>
Sounds like some sort of bug to me, perhaps where some piece of software<br>
neglects to take DST into account.<br></blockquote><div> </div><div>Sounds plausible to me. Digital cameras attach metadata in an EXIF file, the exiv2 will let you read this file directly: <a href="http://www.exiv2.org/sample.html">http://www.exiv2.org/sample.html</a> Perhaps the machines.software interpret this file differently (i.e. DST stettings))<br>
Of course there's lots of reasons a timestamp won't match reality: <a href="http://www.slate.com/id/2140303/">http://www.slate.com/id/2140303/</a> <br><br><br>-Carl<br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<font color="#888888"><br>
Rod<br>
</font><div><div></div><div class="h5">_______________________________________________<br>
vox-tech mailing list<br>
<a href="mailto:vox-tech@lists.lugod.org">vox-tech@lists.lugod.org</a><br>
<a href="http://lists.lugod.org/mailman/listinfo/vox-tech" target="_blank">http://lists.lugod.org/mailman/listinfo/vox-tech</a><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Carl Boettiger<br>Population Biology, UC Davis<br><a href="http://two.ucdavis.edu/~cboettig">http://two.ucdavis.edu/~cboettig</a><br>