diff --git a/pygeoapi/util.py b/pygeoapi/util.py
index 50d49f155..c7301de13 100644
--- a/pygeoapi/util.py
+++ b/pygeoapi/util.py
@@ -132,10 +132,12 @@ def dategetter(date_property: str, collection: dict, raw: bool = False) -> str:
     if value is None:
         return None
 
+    value2 = value.isoformat()
+
     if raw:
         return value
     else:
-        return value.isoformat()
+        return value2
 
 
 def get_typed_value(value: str) -> Union[bool, float, int, str]: