Jackson Date Serialize and Deserialize with UTC+0 format and UTC+4

public class JacksonConfig {

    private static final String DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss";

    public static class CustomLocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {

        private static final DateTimeFormatter DATE_TIME_FORMATTER =
                DateTimeFormatter.ofPattern(DATE_TIME_FORMAT);

        @Override
        public Class<LocalDateTime> handledType() {
            return LocalDateTime.class;
        }

        @Override
        public LocalDateTime deserialize(JsonParser parser, DeserializationContext ctxt)
                throws IOException {
            LocalDateTime dateTime = LocalDateTime.parse(parser.getText(), DATE_TIME_FORMATTER);
            return dateTime.atZone(ZoneId.of("UTC"))
                    .withZoneSameInstant(ZoneId.systemDefault()).toLocalDateTime();
        }

    }

    public static class CustomLocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {

        private static final DateTimeFormatter DATE_TIME_FORMATTER =
                DateTimeFormatter.ofPattern(DATE_TIME_FORMAT);

        @Override
        public Class<LocalDateTime> handledType() {
            return LocalDateTime.class;
        }

        @Override
        public void serialize(LocalDateTime value,
                              JsonGenerator jsonGenerator,
                              SerializerProvider provider) throws IOException {
            LocalDateTime utcDateTime =
                    value.atZone(ZoneId.systemDefault())
                            .withZoneSameInstant(ZoneOffset.UTC)
                            .toLocalDateTime();
            jsonGenerator.writeString(DATE_TIME_FORMATTER.format(utcDateTime));
        }

    }

} 

Let's say we want to return date with UTC+0 format to frontend, which is in UTC+4 format in service. For this case we have to serialize date with UTC+0 format, and deserialize with. UTC+4 format when we receive this parameter again.

For this purpose we can create this config and annotated parameter with @JsonSerialize annotation

in request class:

(Request obj maybe date or string type for this case implementation maybe a little bit different for deserialize)

@JsonDeserialize(using = JacksonConfig.CustomLocalDateTimeDeserializer.class)
private LocalDateTime beginDate;

in response class:

@JsonSerialize(using = JacksonConfig.CustomLocalDateTimeSerializer.class)
private LocalDateTime beginDate;