This subroutine will highlight the dates with content/events by making the date size appear bigger for those days. The argument to the subroutine should be an HTML::CalendarMonthSimple object that is finished with processing and ready to be displayed.
sub highlight_days {
my ($cal) = @_;
$cal->showdatenumbers(0);
for (1..32) { # this works! months will still display with
# the correct number of days.
my $content = $cal->getcontent($_);
my $size = $content ? "120%" : "90%";
$cal->setcontent($_, qq[
<b style="font-size:$size;float:right">$_</b>
<span style="float:left">$content</span>
]);
}
return $cal;
}