You will need to cast $dd to an int in order for setdatehref() to actually work on zero padded numbers (it doesn't like leading zeroes): 
$dd = int(substr($date,6,2));

[download]
Also, you are creating a new HTML::CalendarMonthSimple object with each iteration of the while loop. You will need to change that to read the first line from <DATA> first, then create the table, then add the links: 
my $line = <DATA>;
($yyyy,$mm) = $line =~ /\.(\d{4})(\d\d)/;
$cal = new HTML::CalendarMonthSimple('month'=>$mm,'year'=>$yyyy);

do {
   chomp $line;
   ($file, $date) = split('\.', $line);
   $dd = int(substr($date,6,2));
   $cal->setdatehref($dd, "/home/trixee/cal.txt",);
} while ($line = <DATA>);

print $cal->as_HTML();

[download]

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to (jeffa) Re: HTML calendar w/dates = links by jeffa
in thread HTML calendar w/dates = links by Anonymous Monk

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.