diff --git a/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/EventFacet.java b/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/EventFacet.java
index 800256f..09c7a90 100644
--- a/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/EventFacet.java
+++ b/src/main/java/org/gcube/resourcemanagement/model/reference/entities/facets/EventFacet.java
@@ -6,7 +6,7 @@ package org.gcube.resourcemanagement.model.reference.entities.facets;
 import java.net.URI;
 import java.util.Date;
 
-import org.gcube.informationsystem.base.reference.ISConstants;
+import org.gcube.informationsystem.base.reference.Element;
 import org.gcube.informationsystem.model.reference.entities.Facet;
 import org.gcube.informationsystem.types.annotations.ISProperty;
 import org.gcube.resourcemanagement.model.impl.entities.facets.EventFacetImpl;
@@ -25,7 +25,7 @@ public interface EventFacet extends Facet {
 	public static final String DESCRIPTION = "Event Facet";
 	public static final String VERSION = "1.0.0";
 	
-	@JsonFormat(shape= JsonFormat.Shape.STRING, pattern = ISConstants.DATETIME_PATTERN)
+	@JsonFormat(shape= JsonFormat.Shape.STRING, pattern = Element.DATETIME_PATTERN)
 	@ISProperty(mandatory=true, nullable=false)
 	public Date getDate();