diff --git a/apps/search_indexes/documents/establishment.py b/apps/search_indexes/documents/establishment.py
index 9e1d0a82..aca81f3f 100644
--- a/apps/search_indexes/documents/establishment.py
+++ b/apps/search_indexes/documents/establishment.py
@@ -116,6 +116,7 @@ class EstablishmentDocument(Document):
             'weekday': fields.IntegerField(attr='weekday'),
             'weekday_display': fields.KeywordField(attr='get_weekday_display'),
             'closed_at': fields.KeywordField(attr='closed_at_str'),
+            'opening_at': fields.KeywordField(attr='opening_at_str'),
         }
     ))
     address = fields.ObjectField(
diff --git a/apps/timetable/models.py b/apps/timetable/models.py
index cf7f8d94..90a6ae38 100644
--- a/apps/timetable/models.py
+++ b/apps/timetable/models.py
@@ -39,6 +39,10 @@ class Timetable(ProjectBaseMixin):
     def closed_at_str(self):
         return str(self.closed_at) if self.closed_at else None
 
+    @property
+    def opening_at_str(self):
+        return str(self.opening_at) if self.opening_at else None
+
     @property
     def opening_time(self):
         return self.opening_at or self.lunch_start or self.dinner_start