use strict;
use warnings;

use DateTime qw( );

my $sdt = DateTime->new(
    year  => 2010,
    month =>    3,
    day   =>    9,
);

my $edt = DateTime->new(
    year  => 2010,
    month =>    3,
    day   =>   16,
);

for (my $dt = $sdt->clone(); $dt<=$edt; $dt->add( days => 1 )) {
    print($dt->ymd(), "\n");
}