What does it say in the Date::Manip documentation? Date::Manip::Calc may be of particular interest.

#!/usr/local/bin/perl

use Time::Local;

# months start at 0
# years have 1900 subtracted:

###time=timelocal($sec, $min, $hours, $day, $mon, $year)
$time1=timelocal(30, 20, 18, , 2, 7, 106);
$time2=timelocal(45, 15, 12, , 4, 7, 106);

$time3=$time2-$time1;

print "$time3 difference in seconds\n";
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"TO CALCULATE THE AMOUNT OF TIME BETWEEN TWO DATES"

#!/usr/bin/perl

use strict;
use warnings;
use Date::Day;

print my $result = &day(03,11,2011), "\n",
                   &day(04,11,2011), "\n";
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Uh... makes what extremely easy?

Your answer seems to be only tangentially related to the question.

It is pretty much a “given” that, no matter what common task it is that you’re doing, someone out there on CPAN has done it .. and has done it well.   So, the first course of action in almost every case should be to first use “Super Search” here, then to go to http://search.cpan.org.

CPAN modules are routinely accompanied by a thorough self-test suite that runs automatically on your system as part of the installation sequence.   (The module won’t install unless it first passes all of the tests, and there could be several hundred of these.)   So, by choosing the highest-level module that matches your problem most completely, you come away with a thoroughly written and tested solution that you didn’t have to write.

Actum ne agas – do not do a thing already done.

He already knows about CPAN. That's where the module--clearly mentioned in both the title and the body of the OP's post--lives.

Which makes this post, like 90% of those you make, pointless, platitudinous, fatuous froth.

So desperate are you to say something, you'll say anything, no matter how irrelevant or wrong.

---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.