diff --git a/src/main/resources/alma/common/describedBy.xml b/src/main/resources/alma/common/describedBy.xml
index 2f8edd052..6322dc7cd 100644
--- a/src/main/resources/alma/common/describedBy.xml
+++ b/src/main/resources/alma/common/describedBy.xml
@@ -36,7 +36,7 @@
 			<combine name="endTime" value="${a}">
 				<choose name="a">
 					<data source="@createTime" name="a">
-						<regexp match="0" format="dummy"/>
+						<regexp match="0" format="0000-00-00T00:00:00"/>
 					</data>
 					<data name="a" source="@almaMmsId">
 						<timestamp format="yyyy-MM-dd'T'HH:mm:ss" timezone="Europe/Berlin"/>