diff --git a/.changes/unreleased/Fixed-20231019-114350.yaml b/.changes/unreleased/Fixed-20231019-114350.yaml
new file mode 100644
index 000000000..dbb6b4166
--- /dev/null
+++ b/.changes/unreleased/Fixed-20231019-114350.yaml
@@ -0,0 +1,6 @@
+kind: Fixed
+body: '[export] fix date range selection on filter and grouping "by status of the
+  course at date", on accompanying periods'
+time: 2023-10-19T11:43:50.455829748+02:00
+custom:
+  Issue: "177"
diff --git a/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/StepAggregator.php b/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/StepAggregator.php
index dd5c26371..a9439a63f 100644
--- a/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/StepAggregator.php
+++ b/src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingCourseAggregators/StepAggregator.php
@@ -49,7 +49,7 @@ final readonly class StepAggregator implements AggregatorInterface
                         $qb->expr()->lte(self::A.'.startDate', ':'.self::P),
                         $qb->expr()->orX(
                             $qb->expr()->isNull(self::A.'.endDate'),
-                            $qb->expr()->lt(self::A.'.endDate', ':'.self::P)
+                            $qb->expr()->gt(self::A.'.endDate', ':'.self::P)
                         )
                     )
                 )
diff --git a/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/StepFilterOnDate.php b/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/StepFilterOnDate.php
index bca812b86..66355e44d 100644
--- a/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/StepFilterOnDate.php
+++ b/src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/StepFilterOnDate.php
@@ -61,7 +61,7 @@ class StepFilterOnDate implements FilterInterface
                     $qb->expr()->lte(self::A.'.startDate', ':'.self::P),
                     $qb->expr()->orX(
                         $qb->expr()->isNull(self::A.'.endDate'),
-                        $qb->expr()->lt(self::A.'.endDate', ':'.self::P)
+                        $qb->expr()->gt(self::A.'.endDate', ':'.self::P)
                     )
                 )
             )