I modified test.pl and your .pm file. This works for me:

$ find .
.
./test.pl
./Dante
./Dante/Correlation
./Dante/Correlation/CorrelationEngine.pm
$ 
$ 
$ cat Dante/Correlation/CorrelationEngine.pm
#
#   Dante::Correlation::CorrelationEngine.pm - Implements top-level co
+rrelation logic.
#
##########
package Dante::Correlation::CorrelationEngine;

use strict;
use warnings;
use Date::Parse;

# There are a bunch of other .pm includes here, but they are modules f
+or the project, not any other perl module

# There are other functions here, not listed, of course

sub testFunction
    {
        print str2time("2011-03-18 02:39:04") . "\n";
        print str2time("1970-01-01 00:00:10") . "\n";
        print str2time("2012-01-05 14:23:09") . "\n";
    }

#   Must return 1 for the class to be compilable.
1;
#   End of Dante::Correlation::CorrelationEngine.pm
$ 
$ cat ./test.pl
#!/usr/bin/env perl

use warnings;
use strict;
use Dante::Correlation::CorrelationEngine;

Dante::Correlation::CorrelationEngine::testFunction();
$ 
$ 
$ ./test.pl
1300430344
18010
1325791389
$
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