Thread: Problems with timestamp metadata on JPEG file (due to daylight saving hour?)

i'm having trouble understanding how ubuntu deals timestamps in metadata. example i've taken photo camera @ 18:05 (utc+1). on camera itself, shows correct time when view picture on screen.

when copy picture computer, ubuntu adds 1 hour timestamp, thus:

code:

$ ls -l p4280277.jpg  -rwxr-xr-x 1 user group 451097 2012-04-28 19:05 p4280277.jpg

why this? ubuntu trying clever, noting picture taken during british summer time , assuming metadata refers utc? that's source of one-hour time difference can think of. or there other reason?

confirm metadata has not somehow been changed when copying image onto computer, used following python code:

code:

import pil.image, pil.exiftags    # open file  f = pil.image.open('p4280277.jpg')    # metadata dictionary  info_raw = f._getexif()    # find 'datetime' tag  tag in info_raw.keys():      tag_decoded = pil.exiftags.tags.get(tag, tag)      if tag_decoded == 'datetime':          timestamp = info_raw[tag]          break

this gives timestamp = '2012:04:28 18:05:01', metadata on actual file still correct.

interestingly, if run

code:

$ touch -t 201204281805.01 p4280277.jpg

then ubuntu no longer adds 1 hour onto timestamp!

code:

$ ls -l p4280277.jpg  -rwxr-xr-x 1 user group 451097 2012-04-28 18:05 p4280277.jpg

can explain what's happening here?

just out of curiosity...check selected time "system settings"
manual...or automatic?
-t option touch sets time file
man touch quantum leap??

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