diff --git a/Koha/Template/Plugin/KohaDates.pm b/Koha/Template/Plugin/KohaDates.pm
index 783833f7df..a5a48b6c92 100644
--- a/Koha/Template/Plugin/KohaDates.pm
+++ b/Koha/Template/Plugin/KohaDates.pm
@@ -32,12 +32,27 @@ sub filter {
     $config->{with_hours} //= 0;
 
     my $dt = dt_from_string( $text, 'iso' );
+    $dt->add( %$_ ) for _parse_config_for_durations($config); # Allow date add/subtract; see _parse_config_for_durations
 
     return $config->{as_due_date} ?
         output_pref({ dt => $dt, as_due_date => 1, dateformat => $config->{dateformat} }) :
         output_pref({ dt => $dt, dateonly => !$config->{with_hours}, dateformat => $config->{dateformat} });
 }
 
+sub _parse_config_for_durations {
+# Supports passing things like add_years => 1 or subtract_years => 1
+# Same for months, weeks, days, hours, minutes or seconds
+# Returns a list of hashrefs like { years => 1 }, { days => -1 } that can be passed to dt->add
+    my $config = shift;
+    my @results;
+    foreach my $entry ( keys %$config ) {
+        if( $entry =~ /^(add|subtract)_(years|months|weeks|days|hours|minutes|seconds)$/ ) {
+            push @results, { $2 => ( $1 eq 'add' ? 1 : -1 ) * $config->{$entry} };
+        }
+    }
+    return @results;
+}
+
 sub output_preference {
     my ( $self, @params ) = @_;
     return output_pref( @params );