#!/usr/bin/perl

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

my $correlationEngine = Dante::Correlation::CorrelationEngine->new(1);
$correlationEngine->testFunction();

exit;
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#
#   Dante::Correlation::CorrelationEngine.pm - Implements top-level co
+rrelation logic.
#
##########
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
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./test2.pl
Undefined subroutine &Dante::Correlation::CorrelationEngine::str2time 
+called at Dante/Correlation/CorrelationEngine.pm line 664.
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You presumably have the package Dante::Correlation::CorrelationEngine declaration after the use Date::Parse statement — in which case the functions (like str2time) will be exported into main::, not Dante::Correlation::CorrelationEngine.

When I put the package statement in the appropriate place, and add a constructor, the code works fine for me.

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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Hello all!

Yes indeed, the problem was where the package declaration went, and I'd put it after loading strict, warning, all other modules and of course, the Date::Parse module.
I changed it and whew! Now it works :) Thank you everybody; I completely overlooked the package declaration line; oopsie!
Thank you for your time and effort everybody, it is much appreciated :)

Trupti

Where is the package declaration?