@@ -, +, @@ --- Koha/Calendar.pm | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) --- a/Koha/Calendar.pm +++ a/Koha/Calendar.pm @@ -93,7 +93,7 @@ sub addDate { Readonly::Scalar my $return_by_hour => 10; my $day_dur = DateTime::Duration->new( days => 1 ); if ( $add_duration->is_negative() ) { - $day_dur->inverse(); + $day_dur = DateTime::Duration->new( days => -1 ); } if ( $days_mode eq 'Datedue' ) { --