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use Date::Set; ... my @occurs = $set->during (at => $period)->list; print "occurences on ", join (" ,", @occurs), "\n";
use Date::Set; ... foreach (@list) { print "$_\n"; }
$a = Date::Set->event( rule => 'FREQ=YEARLY;INTERVAL=2' ); $a->during( start => '20030801', end => '20200801' ); print $a . "\n";