How to change the EXIF time data for multiple photos at once?

[Archive]

[Originally posted by pxstein on 2009-12-01 16:09:41-08]

I forgot to adjust the timezone/time settings in my DigiCam. So hundereds of photos
contain the wrong creation/last update time information in the EXIF header.

Is there a way to update them all with PSP at once and and to subtract 6 hours?

Editing them all individually would be very unconvenient.

[Archive]

[Originally posted by exiftool on 2009-12-01 16:21:50-08]

I don't know what PSP is, but the exiftool command line to
do this is:

Code:

exiftool -alldates-=6 DIR

Where DIR is the name of the directory containing
your images.

- Phil

[Archive]

[Originally posted by pxstein on 2009-12-01 16:51:05-08]

ok.

But this command does NOT set back the dates (creation, last update) of the file itself
(only the contained EXIF).

Can I somehow change the filename dates as well?

Or - alternatively - can I set the creation and last update date of a file/the files
corresponding the the embedded EXIF date infos?

[Archive]

[Originally posted by exiftool on 2009-12-01 16:55:51-08]

The filesystem modification date can be set by
adding "-filemodifydate-=6" to the command,
or copy the value from an EXIF date/time value
in a separate command (ie. "-filemodifydate<createdate"),
but ExifTool can not write the filesystem creation date.

- Phil