diff --git a/main/src/com/google/refine/model/metadata/AbstractMetadata.java b/main/src/com/google/refine/model/metadata/AbstractMetadata.java
index 43a5ac9b5..5433cdbd0 100644
--- a/main/src/com/google/refine/model/metadata/AbstractMetadata.java
+++ b/main/src/com/google/refine/model/metadata/AbstractMetadata.java
@@ -6,10 +6,16 @@ import java.time.LocalDateTime;
 import org.apache.commons.beanutils.PropertyUtils;
 import org.json.JSONObject;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
 public abstract class AbstractMetadata implements IMetadata {
+    @JsonIgnore
     private MetadataFormat formatName = MetadataFormat.UNKNOWN;
     
+    @JsonIgnore
     protected LocalDateTime written = null;
+    @JsonProperty("modified")
     protected LocalDateTime           _modified;
     
     public MetadataFormat getFormatName() {
diff --git a/main/src/com/google/refine/util/ParsingUtilities.java b/main/src/com/google/refine/util/ParsingUtilities.java
index 06a605729..f4426a989 100644
--- a/main/src/com/google/refine/util/ParsingUtilities.java
+++ b/main/src/com/google/refine/util/ParsingUtilities.java
@@ -59,8 +59,6 @@ import org.json.JSONException;
 import org.json.JSONObject;
 import org.json.JSONTokener;
 
-import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
-import com.fasterxml.jackson.annotation.PropertyAccessor;
 import com.fasterxml.jackson.core.JsonFactory;
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.databind.DeserializationFeature;
@@ -80,11 +78,10 @@ public class ParsingUtilities {
         SimpleModule module = new SimpleModule();
         module.addSerializer(Double.class, new SerializationFilters.DoubleSerializer());
         module.addSerializer(double.class, new SerializationFilters.DoubleSerializer());
-        module.addSerializer(OffsetDateTime.class, new SerializationFilters.DateSerializer());
-
+        module.addSerializer(OffsetDateTime.class, new SerializationFilters.OffsetDateSerializer());
+        module.addSerializer(LocalDateTime.class, new SerializationFilters.LocalDateSerializer());
         
         mapper.registerModule(module);
-       // mapper.setVisibility(PropertyAccessor.ALL, Visibility.NONE);
         mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
     }
     
diff --git a/main/src/com/google/refine/util/SerializationFilters.java b/main/src/com/google/refine/util/SerializationFilters.java
index 984f2ca96..4c937c25f 100644
--- a/main/src/com/google/refine/util/SerializationFilters.java
+++ b/main/src/com/google/refine/util/SerializationFilters.java
@@ -1,6 +1,7 @@
 package com.google.refine.util;
 
 import java.io.IOException;
+import java.time.LocalDateTime;
 import java.time.OffsetDateTime;
 
 import com.fasterxml.jackson.core.JsonGenerator;
@@ -90,10 +91,10 @@ public class SerializationFilters {
     /**
      * Serialize dates by ISO format.
      */
-    public static class DateSerializer extends StdSerializer<OffsetDateTime> {
+    public static class OffsetDateSerializer extends StdSerializer<OffsetDateTime> {
         private static final long serialVersionUID = 93872874L;
 
-        public DateSerializer() {
+        public OffsetDateSerializer() {
             super(OffsetDateTime.class);
         }
 
@@ -103,4 +104,21 @@ public class SerializationFilters {
             gen.writeString(ParsingUtilities.dateToString(arg0));
         }       
     }
+    
+    /**
+     * Serialize dates by ISO format.
+     */
+    public static class LocalDateSerializer extends StdSerializer<LocalDateTime> {
+        private static final long serialVersionUID = 93872874L;
+
+        public LocalDateSerializer() {
+            super(LocalDateTime.class);
+        }
+
+        @Override
+        public void serialize(LocalDateTime arg0, JsonGenerator gen, SerializerProvider s)
+                throws IOException {
+            gen.writeString(ParsingUtilities.localDateToString(arg0));
+        }       
+    }
 }