diff --git a/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java b/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java
index 74b9c5d..fbea795 100644
--- a/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java
+++ b/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java
@@ -48,9 +48,6 @@ public class AccountingPersistenceQueryPostgreSQL implements AccountingPersisten
 	
 	protected static final Logger logger = LoggerFactory.getLogger(AccountingPersistenceQueryPostgreSQL.class);
 	
-	public static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss.SSS Z";
-	
-	
 	public static final String URL_PROPERTY_KEY = AccountingPersistenceConfiguration.URL_PROPERTY_KEY;
 	// private String baseURL;