Once again, thanks for the input - it's been really
useful.

I shied away from epoch seconds as I am only
working with days and the Date::Calc functions seemed
to simplify this.

I had thought that it would be necessary to feed
the $days straight into HTML::CalendarMonth
but it seems that I need to reconvert and I can do that using:

$days = Date_to_Days($year,$month,$day);
  ($year,$month,$day) = Add_Delta_Days(1,1,1, $days - 1);
[download]

from the example page I get:

$c->item($c->month)->wrap_content(font({size => '+2'}));
$c->item($c->dayheaders)->wrap_content(font({size => '-1'}));
$c->item(15,16,17)->wrap_content(font({size => 4, color => 'red'}));
$c->item(6,28)->wrap_content(new HTML::Element 'blink');
$c->item_daycol('Su','Sa')->attr(bgcolor => 'cyan');
print $c->as_HTML;
[download]

Although I haven't cracked the whole thing (I want to
generate the whole calendar using variables $year
$month $day) I have now managed to highlight
the days in the calendar by using the following:

#!/usr/bin/perl -w

use CGI qw(:standard);
use Date::Calc  qw(:all);
use HTML::AsSubs;
use HTML::Element;
use HTML::CalendarMonth;

my $dates = "($year,$month,$day)";

print "Content-type: text/html\n\n";

my @dates = (731158, 731159, 731160, 731161, 731178);

foreach $days (@dates) {
$dates = Add_Delta_Days(1,1,1, $days - 1);

push (@days, $dates);
}

$c = new HTML::CalendarMonth;

             month      => 11,
             year       => 2002,

$c->item($c->month)->wrap_content(font({size => '+2'}));
$c->item($c->dayheaders)->wrap_content(font({size => '-1'}));
$c->item(@days)->wrap_content(font({size => 4, color => 'red'}));
$c->item(6,28)->wrap_content(new HTML::Element 'blink');
$c->item_daycol('Su','Sa')->attr(bgcolor => 'cyan');
print $c->as_HTML;
[download]

Now I think all I have to do is connect in the variables $year $month and I shall be there. (but the midnight hour approacheth so I'll check it out manyana)