Here is my code:

Hmm. I don't think so:

C:\Steve\Dev\PerlMonks\P-2013-10-10@0927-MonthLen>monthlen.pl
Can't locate warning.pm in @INC (@INC contains: C:\Steve\Perl 
    C:/Perl/Perl-5.16.3.1603/site/lib C:/Perl/Perl-5.16.3.1603/lib .) 
    at C:\Steve\Dev\PerlMonks\P-2013-10-10@0927-MonthLen\monthlen.pl l
+ine 3.
BEGIN failed--compilation aborted at C:\Steve\Dev\PerlMonks\P-2013-10-
+10@0927-MonthLen\monthlen.pl line 3.
[download]

I recommend you use a copy-and-paste feature to insert your code between proper <code> and </code> tags.

Please note that </code> is not the same as the [/code] you used.