use DateTime;
use Data::Dumper;

my $date = DateTime->now;

my $dur = $date->subtract_datetime( DateTime->now->subtract( years => 
+1, months => 1 ) );
print "\nmonths: " . $dur->in_units( 'months' ) . "\ndays: " . $dur->i
+n_units( 'days' ) . "\n";

__OUTPUT__
months: 13
days: 0
^^^^^^^

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I would expect it to count the days between the two dates. When examining $dur with Data::Dumper I discovered that it only remembers the difference in months - and since it does not know which months are involved it cannot count the days.

In reply to How can I count the days between two dates? by zby

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