use DateTime::Event::Recurrence;

my $cal = DateTime::Event::Recurrence->yearly( 
    weeks => 5, 
    week_start_day => 'su' ); 

my $dt = DateTime->new( year=> 2004 ); 
for ( 1 .. 10 ) { 
    $dt = $cal->next( $dt ); 
    print $dt, "\n" 
}