diff --git a/backend/condition/utils/date_utils.py b/backend/condition/utils/date_utils.py
index 4535acd9..713d151c 100644
--- a/backend/condition/utils/date_utils.py
+++ b/backend/condition/utils/date_utils.py
@@ -5,6 +5,14 @@ from typing import Any
 def normalise_date(value: Any, allow_none: bool = True) -> date | None:
     if value is None and allow_none:
         return None
+    
     if isinstance(value, datetime):
         return value.date()
+    
+    if isinstance(value, str):
+        try:
+            return datetime.strptime(value.strip(), "%d/%m/%Y").date()
+        except ValueError as exc:
+            raise ValueError(f"Invalid date string: {value!r}") from exc
+        
     raise ValueError(f"Unexpected date value: {value!r}")
\ No newline at end of file