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my $cgi = new CGI;
# .... bunch of calendarview.pl code here ....
...
$newyears->param('month',1);
$newyears->param('day',1);
my $newyears_url = $newyears->self_url;

sub new_self_url {
    my %params = @_;
...
# dates like this:
my $newyears = new_self_url(month => 1, day => 1);
my $christmas = new_self_url(month => 12, day => 25);