The second listing when I searched Google (today is Google's seventh 
birthday BTW) for *jpeg metadata*.

The PHP JPEG Metadata Toolkit:
http://www.ozhiker.com/electronics/pjmt/

Looks like what you want, but I don't know if you can use PHP scripts.  
Documentation seems sketchy at best.  Good luck.

Russell McMahon wrote:

>        > try stamp. it does exactly what you need!
>
>>
>> http://www.klingebiel.com/tempest/index.php4
>
>
>
> Thanks.
> It looks excellent.
> It's NOT what I asked for, which was
>
>>> ... software that will set a JPG file's date and time based on the 
>>> EXIF data?
>>
>
> BUT in the absence of that STAMP achieves the same result for 
> practical purposes.
>
> What it does is prefix the file name with a sort ordered date and time 
> (YYYY MM DD HH MM SS old file name) so that files sort correctly in 
> date order and you can tell at a glance when they were taken.
>
> The other utilities also look excellent.
> I haven't figured out the catch yet.
> There is no charge and no licence mentioned that I could see.
> Whether there is spyware is yet to be seen.
>
>
>
>        RM
>

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