diff --git a/Koha/Calendar.pm b/Koha/Calendar.pm
index 67d2a6b568..f6a276f21c 100644
--- a/Koha/Calendar.pm
+++ b/Koha/Calendar.pm
@@ -327,7 +327,7 @@ sub days_between {
 
     # start and end should not be closed days
     my $days = $start_dt->delta_days($end_dt)->delta_days;
-    for (my $dt = $start_dt->clone();
+    for (my $dt = $start_dt->clone()->set_time_zone('floating');
         $dt <= $end_dt;
         $dt->add(days => 1)
     ) {
@@ -351,7 +351,7 @@ sub hours_between {
     # take into account open/close times then it would be a duration
     # of library open hours
     my $skipped_days = 0;
-    for (my $dt = $start_dt->clone();
+    for (my $dt = $start_dt->clone()->set_time_zone('floating');
         $dt <= $end_dt;
         $dt->add(days => 1)
     ) {