Try to update.

On a newer Perl version it looks fine, even without setting locale parameter: 
% perl /tmp/scratch.pl  
2015-08-24T17:36:47

% perl -v

This is perl 5, version 20, subversion 2 (v5.20.2) built for x86_64-linux-gnu-thread-multi
...

% dpkg -l|grep libdatetime.*perl
...
ii  libdatetime-perl                              2:1.20-1 
ii  libdatetime-locale-perl                       1:0.46-1
...
/tmp/scratch.pl contains: 
use warnings;
use strict;

use DateTime;

# [faked method call]
print MakeDateTime(undef, 2015, 8, 24, 17, 36, 47, 144);

sub MakeDateTime {
  my $self = shift;
  my ($Year, $Month, $Day, $Hour, $Minute, $Second, $MilliSecond) = @_
+;

  my $DateTime = DateTime->new(
    year       => $Year,
    month      => $Month,
    day        => $Day,
    hour       => $Hour,
    minute     => $Minute,
    second     => $Second,
    nanosecond => ($MilliSecond * 1000000),
    time_zone  => 'America/New_York',
  );

  return $DateTime;
}

[download]

In reply to Re^2: Strange Params::Validate Error by Monk::Thomas
in thread Strange Params::Validate Error by Stringer

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.