diff --git a/src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskDatabase.java b/src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskDatabase.java
index e16a74d..37c7016 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskDatabase.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskDatabase.java
@@ -5,6 +5,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
+import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
 
 import java.io.File;
 import java.io.IOException;
@@ -34,7 +35,10 @@ public class JsonTaskDatabase implements TaskDatabase{
     static {
         DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd");
         LocalDateDeserializer dateDeserializer = new LocalDateDeserializer(dateFormat);
+        LocalDateSerializer dateSerializer = new LocalDateSerializer(dateFormat);
+
         timeModule.addDeserializer(LocalDate.class, dateDeserializer);
+        timeModule.addSerializer(LocalDate.class, dateSerializer);
     }
 
     /**