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my $dur = DateTime::Duration->new( years => 1, months => 15 );
 
...
$dur->in_units('months');               # 27
$dur->in_units( 'years', 'months' );    # (2, 3)
$dur->in_units( 'weeks', 'days' );      # (0, 0) !

my $diff = $dt1 - $dt2;