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1. Overview

In this tutorial, we’ll serialize dates with Jackson. We’ll start by serializing a simple java.util.Date, then Joda-Time, and finally, the Java 8 DateTime.

2. Serialize Date to Timestamp

First, let’s see how to serialize a simple java.util.Date with Jackson.

In the following example, we’ll serialize an instance of “Event,” which has the Date field “eventDate“:

@Test
public void whenSerializingDateWithJackson_thenSerializedToTimestamp()
  throws JsonProcessingException, ParseException {
 
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm");
    df.setTimeZone(TimeZone.getTimeZone("UTC"));

    Date date = df.parse("01-01-1970 01:00");
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    mapper.writeValueAsString(event);
}

It’s important to note that Jackson will serialize the Date to a timestamp format by default (number of milliseconds since January 1st, 1970, UTC).

The actual output of the “event” serialization is:

{
   "name":"party",
   "eventDate":3600000
}

3. Serialize Date to ISO-8601

Serializing to this terse timestamp format is not optimal. Instead, let’s serialize the Date to the ISO-8601 format:

@Test
public void whenSerializingDateToISO8601_thenSerializedToText()
  throws JsonProcessingException, ParseException {
 
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm");
    df.setTimeZone(TimeZone.getTimeZone("UTC"));

    String toParse = "01-01-1970 02:30";
    Date date = df.parse(toParse);
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    // StdDateFormat is ISO8601 since jackson 2.9
    mapper.setDateFormat(new StdDateFormat().withColonInTimeZone(true));
    String result = mapper.writeValueAsString(event);
    assertThat(result, containsString("1970-01-01T02:30:00.000+00:00"));
}

We can see that the representation of the date is now much more readable.

4. Configure ObjectMapper DateFormat

The previous solutions still lack the full flexibility of choosing the exact format to represent the java.util.Date instances.

Conversely, let’s take a look at a configuration that will allow us to set our formats for representing dates:

@Test
public void whenSettingObjectMapperDateFormat_thenCorrect()
  throws JsonProcessingException, ParseException {
 
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm");

    String toParse = "20-12-2014 02:30";
    Date date = df.parse(toParse);
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    mapper.setDateFormat(df);

    String result = mapper.writeValueAsString(event);
    assertThat(result, containsString(toParse));
}

Note that, even though we’re now more flexible regarding the date format, we’re still using a global configuration at the level of the entire ObjectMapper.

5. Use @JsonFormat to Format Date

Next let’s take a look at the @JsonFormat annotation to control the date format on individual classes, instead of globally, for the entire application:

public class Event {
    public String name;

    @JsonFormat
      (shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy hh:mm:ss")
    public Date eventDate;
}

Now let’s test it:

@Test
public void whenUsingJsonFormatAnnotationToFormatDate_thenCorrect()
  throws JsonProcessingException, ParseException {
 
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
    df.setTimeZone(TimeZone.getTimeZone("UTC"));

    String toParse = "20-12-2014 02:30:00";
    Date date = df.parse(toParse);
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    String result = mapper.writeValueAsString(event);
    assertThat(result, containsString(toParse));
}

6. Custom Date Serializer

Next, to get full control over the output, we’ll leverage a custom serializer for Dates:

public class CustomDateSerializer extends StdSerializer<Date> {
 
    private SimpleDateFormat formatter 
      = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");

    public CustomDateSerializer() {
        this(null);
    }

    public CustomDateSerializer(Class t) {
        super(t);
    }
    
    @Override
    public void serialize (Date value, JsonGenerator gen, SerializerProvider arg2)
      throws IOException, JsonProcessingException {
        gen.writeString(formatter.format(value));
    }
}

Now we’ll use it as the serializer of our “eventDate” field:

public class Event {
    public String name;

    @JsonSerialize(using = CustomDateSerializer.class)
    public Date eventDate;
}

Finally, we’ll test it:

@Test
public void whenUsingCustomDateSerializer_thenCorrect()
  throws JsonProcessingException, ParseException {
 
    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");

    String toParse = "20-12-2014 02:30:00";
    Date date = df.parse(toParse);
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    String result = mapper.writeValueAsString(event);
    assertThat(result, containsString(toParse));
}

Further reading:

How To Serialize and Deserialize Enums with Jackson

How to serialize and deserialize an Enum as a JSON Object using Jackson 2.

Jackson - Custom Serializer

Control your JSON output with Jackson 2 by using a Custom Serializer.

Getting Started with Custom Deserialization in Jackson

Use Jackson to map custom JSON to any java entity graph with full control over the deserialization process.

7. Serialize Joda-Time With Jackson

Dates aren’t always an instance of java.util.Date. In fact, more and more, dates are represented by some other class, and a common one is the DateTime implementation from the Joda-Time library.

Let’s see how we can serialize DateTime with Jackson.

We’ll make use of the jackson-datatype-joda module for out-of-the-box Joda-Time support:

<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-joda</artifactId>
  <version>2.17.2</version>
</dependency>

Then we can simply register the JodaModule and be done:

@Test
public void whenSerializingJodaTime_thenCorrect() 
  throws JsonProcessingException {
    DateTime date = new DateTime(2014, 12, 20, 2, 30, 
      DateTimeZone.forID("Europe/London"));

    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JodaModule());
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

    String result = mapper.writeValueAsString(date);
    assertThat(result, containsString("2014-12-20T02:30:00.000Z"));
}

8. Serialize Joda DateTime With Custom Serializer

If we don’t want the extra Joda-Time Jackson dependency, we can also make use of a custom serializer (similar to the earlier examples) to get DateTime instances serialized cleanly:

public class CustomDateTimeSerializer extends StdSerializer<DateTime> {

    private static DateTimeFormatter formatter = 
      DateTimeFormat.forPattern("yyyy-MM-dd HH:mm");

    public CustomDateTimeSerializer() {
        this(null);
    }

     public CustomDateTimeSerializer(Class<DateTime> t) {
         super(t);
     }
    
    @Override
    public void serialize
      (DateTime value, JsonGenerator gen, SerializerProvider arg2)
      throws IOException, JsonProcessingException {
        gen.writeString(formatter.print(value));
    }
}

Then we can use it as our property “eventDate” serializer:

public class Event {
    public String name;

    @JsonSerialize(using = CustomDateTimeSerializer.class)
    public DateTime eventDate;
}

Finally, we can put everything together and test it:

@Test
public void whenSerializingJodaTimeWithJackson_thenCorrect() 
  throws JsonProcessingException {
 
    DateTime date = new DateTime(2014, 12, 20, 2, 30);
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    String result = mapper.writeValueAsString(event);
    assertThat(result, containsString("2014-12-20 02:30"));
}

9. Serialize Java 8 Date With Jackson

Now let’s see how to serialize Java 8 DateTime, in this example LocalDateTime, using Jackson. We can make use of the jackson-datatype-jsr310 module:

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.17.2</version>
</dependency>

Then all we need to do is register the JavaTimeModule (JSR310Module is deprecated), and Jackson will take care of the rest:

@Test
public void whenSerializingJava8Date_thenCorrect()
  throws JsonProcessingException {
    LocalDateTime date = LocalDateTime.of(2014, 12, 20, 2, 30);

    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JavaTimeModule());
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

    String result = mapper.writeValueAsString(date);
    assertThat(result, containsString("2014-12-20T02:30"));
}

10. Serialize Java 8 Date Without Any Extra Dependency

If we don’t want the extra dependency, we can always use a custom serializer to write out the Java 8 DateTime to JSON:

public class CustomLocalDateTimeSerializer 
  extends StdSerializer<LocalDateTime> {

    private static DateTimeFormatter formatter = 
      DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");

    public CustomLocalDateTimeSerializer() {
        this(null);
    }
 
    public CustomLocalDateTimeSerializer(Class<LocalDateTime> t) {
        super(t);
    }
    
    @Override
    public void serialize(
      LocalDateTime value,
      JsonGenerator gen,
      SerializerProvider arg2)
      throws IOException, JsonProcessingException {
 
        gen.writeString(formatter.format(value));
    }
}

Then we’ll use the serializer for our “eventDate” field:

public class Event {
    public String name;

    @JsonSerialize(using = CustomLocalDateTimeSerializer.class)
    public LocalDateTime eventDate;
}

Finally, we’ll test it:

@Test
public void whenSerializingJava8DateWithCustomSerializer_thenCorrect()
  throws JsonProcessingException {
 
    LocalDateTime date = LocalDateTime.of(2014, 12, 20, 2, 30);
    Event event = new Event("party", date);

    ObjectMapper mapper = new ObjectMapper();
    String result = mapper.writeValueAsString(event);
    assertThat(result, containsString("2014-12-20 02:30"));
}

11. Deserialize Date

Now let’s see how we can deserialize a Date with Jackson. In the following example, we’ll deserialize an “Event” instance containing a date:

@Test
public void whenDeserializingDateWithJackson_thenCorrect()
  throws JsonProcessingException, IOException {
 
    String json = "{"name":"party","eventDate":"20-12-2014 02:30:00"}";

    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
    ObjectMapper mapper = new ObjectMapper();
    mapper.setDateFormat(df);

    Event event = mapper.readerFor(Event.class).readValue(json);
    assertEquals("20-12-2014 02:30:00", df.format(event.eventDate));
}

12. Deserialize Joda ZonedDateTime With Time Zone Preserved

In its default configuration, Jackson adjusts the time zone of a Joda ZonedDateTime to the time zone of the local context. Since the time zone of the local context is not set by default, and has to be configured manually, Jackson adjusts the time zone to GMT:

@Test
public void whenDeserialisingZonedDateTimeWithDefaults_thenNotCorrect()
  throws IOException {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.findAndRegisterModules();
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Europe/Berlin"));
    String converted = objectMapper.writeValueAsString(now);

    ZonedDateTime restored = objectMapper.readValue(converted, ZonedDateTime.class);
    System.out.println("serialized: " + now);
    System.out.println("restored: " + restored);
    assertThat(now, is(restored));
}

The test case will fail with output:

serialized: 2017-08-14T13:52:22.071+02:00[Europe/Berlin]
restored: 2017-08-14T11:52:22.071Z[UTC]

Fortunately, there is a quick and simple fix for this odd default behavior; we just have to tell Jackson not to adjust the time zone.

This can be done by adding the below line of code to the above test case:

objectMapper.disable(DeserializationFeature.ADJUST_DATES_TO_CONTEXT_TIME_ZONE);

Note that, to preserve the time zone, we also have to disable the default behavior of serializing the date to the timestamp.

13. Custom Date Deserializer

We can also use a custom Date deserializer. We’ll write a custom deserializer for the property “eventDate“:

public class CustomDateDeserializer extends StdDeserializer<Date> {

    private SimpleDateFormat formatter = 
      new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");

    public CustomDateDeserializer() {
        this(null);
    }

    public CustomDateDeserializer(Class<?> vc) {
        super(vc);
    }

    @Override
    public Date deserialize(JsonParser jsonparser, DeserializationContext context)
      throws IOException, JsonProcessingException {
        String date = jsonparser.getText();
        try {
            return formatter.parse(date);
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
    }
}

Next we’ll use it as the “eventDate” deserializer:

public class Event {
    public String name;

    @JsonDeserialize(using = CustomDateDeserializer.class)
    public Date eventDate;
}

Finally, we’ll test it:

@Test
public void whenDeserializingDateUsingCustomDeserializer_thenCorrect()
  throws JsonProcessingException, IOException {
 
    String json = "{"name":"party","eventDate":"20-12-2014 02:30:00"}";

    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy hh:mm:ss");
    ObjectMapper mapper = new ObjectMapper();

    Event event = mapper.readerFor(Event.class).readValue(json);
    assertEquals("20-12-2014 02:30:00", df.format(event.eventDate));
}

14. Fixing InvalidDefinitionException

When creating a LocalDate instance, we may come across an exception:

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance
of `java.time.LocalDate`(no Creators, like default construct, exist): no String-argument
constructor/factory method to deserialize from String value ('2014-12-20') at [Source:
(String)"2014-12-20"; line: 1, column: 1]

This problem occurs because JSON doesn’t natively have a date format, so it represents dates as String.

The String representation of a date isn’t the same as an object of type LocalDate in memory, so we need an external deserializer to read that field from a String, and a serializer to render the date to String format.

These methods also apply to LocalDateTime, the only change is to use an equivalent class for LocalDateTime.

14.1. Jackson Dependency

Jackson allows us to fix this in a couple of ways. First, we have to make sure the jsr310 dependency is in our pom.xml:

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.17.2</version>
</dependency>

14.2. Serialization to Single Date Object

In order to be able to handle LocalDate, we need to register the JavaTimeModule with our ObjectMapper.

We also need to disable the feature WRITE_DATES_AS_TIMESTAMPS in ObjectMapper to prevent Jackson from adding time digits to the JSON output:

@Test
public void whenSerializingJava8DateAndReadingValue_thenCorrect() throws IOException {
    String stringDate = "\"2014-12-20\"";

    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JavaTimeModule());
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

    LocalDate result = mapper.readValue(stringDate, LocalDate.class);
    assertThat(result.toString(), containsString("2014-12-20"));
}

Here we used Jackson’s native support for serializing and deserializing dates.

14.3. Annotation in POJO

Another way to deal with the problem is to use the LocalDateDeserializer and JsonFormat annotations at the entity level:

public class EventWithLocalDate {

    @JsonDeserialize(using = LocalDateDeserializer.class)
    @JsonSerialize(using = LocalDateSerializer.class)
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy")
    public LocalDate eventDate;
}

The @JsonDeserialize annotation is used to specify a custom deserializer to unmarshal the JSON object. Similarly, @JsonSerialize indicates a custom serializer to use when marshaling the entity.

In addition, the annotation @JsonFormat allows us to specify the format in which we will serialize date values. Therefore, this POJO can be used to read and write the JSON:

@Test
public void whenSerializingJava8DateAndReadingFromEntity_thenCorrect() throws IOException {
    String json = "{\"name\":\"party\",\"eventDate\":\"20-12-2014\"}";

    ObjectMapper mapper = new ObjectMapper();

    EventWithLocalDate result = mapper.readValue(json, EventWithLocalDate.class);
    assertThat(result.getEventDate().toString(), containsString("2014-12-20"));
}

While this approach takes more work than using the JavaTimeModule defaults, it’s a lot more customizable.

15. Conclusion

In this extensive Date article, we examined several ways that Jackson can help marshal and unmarshal a date to JSON using a sensible format we have control over.

The code backing this article is available on GitHub. Once you're logged in as a Baeldung Pro Member, start learning and coding on the project.
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