I needed to coordinate photos from three cameras with three different clock settings - one was correct, one an hour ahead, and one 2 hours ahead. I used similar code, but many pictures failed to update with a "Maker offsets" warning. The FixBase => '' option fixed that, and below is the code: 

use strict;
use warnings;
use Image::ExifTool;
chdir("C:/Users/hbm/pictures/trip") or die("Unable to chdir: $!");

my $tool    = Image::ExifTool->new();
$tool      -> Options(FixBase => '');   # "best guess" for fixing Make
+r offsets

for my $jpg (glob("*.JPG")) {
   $tool      -> ExtractInfo($jpg);
   my $camera  = $tool->GetValue("Model");
   next          if $camera =~ /KODAK/i;
   
   my $shift   = ($camera =~ /SD1200/i) ? "2:00" : "1:00";
   $tool      -> SetNewValue(DateTimeOriginal => $shift, Shift => -1);
   my $success = $tool->WriteInfo($jpg);

   print "$jpg Update failed: ", $tool->GetValue('Error'), "\n"    if 
+!$success;
}

[download]

In reply to Re: (Solved) Change "Date Picture Taken" with Image::ExifTool by hbm
in thread (Solved) Change "Date Picture Taken" with Image::ExifTool by Limbic~Region

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.