diff --git a/src/main/java/eu/europa/ec/dgc/gateway/connector/dto/RevocationBatchDto.java b/src/main/java/eu/europa/ec/dgc/gateway/connector/dto/RevocationBatchDto.java
index bd6eb0e..f518fcf 100644
--- a/src/main/java/eu/europa/ec/dgc/gateway/connector/dto/RevocationBatchDto.java
+++ b/src/main/java/eu/europa/ec/dgc/gateway/connector/dto/RevocationBatchDto.java
@@ -35,7 +35,6 @@ public class RevocationBatchDto {
 
     private String country;
 
-    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
     private ZonedDateTime expires;
 
     private String kid;
diff --git a/src/test/java/eu/europa/ec/dgc/gateway/connector/RevocationListUploadConnectorTest.java b/src/test/java/eu/europa/ec/dgc/gateway/connector/RevocationListUploadConnectorTest.java
index 318d8c5..f8c3371 100644
--- a/src/test/java/eu/europa/ec/dgc/gateway/connector/RevocationListUploadConnectorTest.java
+++ b/src/test/java/eu/europa/ec/dgc/gateway/connector/RevocationListUploadConnectorTest.java
@@ -27,6 +27,7 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.util.StdDateFormat;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import eu.europa.ec.dgc.gateway.connector.client.DgcGatewayConnectorRestClient;
 import eu.europa.ec.dgc.gateway.connector.dto.RevocationBatchDeleteRequestDto;
@@ -72,6 +73,7 @@ class RevocationListUploadConnectorTest {
     @Autowired
     DgcTestKeyStore testKeyStore;
 
+    ObjectMapper mapper = new ObjectMapper();
 
     @Test
     void testUploadOfRevocationList() throws Exception {
@@ -344,15 +346,15 @@ private RevocationBatchDto getRevocation() {
     }
 
     private String getRevocationJSON() throws JsonProcessingException {
-        ObjectMapper mapper = new ObjectMapper();
         mapper.registerModule(new JavaTimeModule());
+        mapper.setDateFormat(new StdDateFormat().withColonInTimeZone(true));
         return mapper.writeValueAsString(getRevocation());
     }
 
     private String getDeleteJSON(String batchId) throws JsonProcessingException {
         RevocationBatchDeleteRequestDto deleteRequest = new RevocationBatchDeleteRequestDto();
         deleteRequest.setBatchId(batchId);
-        ObjectMapper mapper = new ObjectMapper();
+
         mapper.registerModule(new JavaTimeModule());
         return mapper.writeValueAsString(deleteRequest);
     }