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Failed to convert property value of type java.lang.String to required type java.time.LocalDateTime

There are many similar questions for my problem but I didn't find resolution. Fragment of entity:

@DateTimeFormat
private LocalDateTime valid_from;
@DateTimeFormat
private LocalDateTime valid_to;
My form has format yyyy-MM-dd. I already tried annotation @DateTimeFormat(format="yyyy-MM-dd") and ISO. I tried with:
 @InitBinder
public void initBinder(WebDataBinder webDataBinder) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    dateFormat.setLenient(true);
    webDataBinder.registerCustomEditor(LocalDateTime.class, new CustomDateEditor(dateFormat, true));
@Converter(autoApply = false)
public class LocalDateTimeConverter implements AttributeConverter<LocalDateTime, String> {
private final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
@Override
public String convertToDatabaseColumn(LocalDateTime locDate) {
    return (locDate == null ? null : formatter.format(locDate));
@Override
public LocalDateTime convertToEntityAttribute(String dateValue) {
    return (dateValue == null ? null : LocalDateTime.parse(dateValue, formatter));
but I still have binding errors:
  
Failed to convert property value of type java.lang.String to required type java.time.LocalDateTime for property valid_from; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.format.annotation.DateTimeFormat java.time.LocalDateTime] for value 2019-01-20; nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2019-01-20]
                In this form I need only date. But in other cases I will need also time. My column in database is timestamp not text. I prefer LocalDateTime rather than sql Date api.
– GarryMoveOut
                Jan 26, 2019 at 17:50
You can add custom Serializer and Deserializer to accomplish what you want to do. Define a serializer like below.
public class MyDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
    private static DateTimeFormatter formatter = ISODateTimeFormat.dateTime();
    @Override
    public DateTime deserialize(final JsonParser jsonParser,
                                final DeserializationContext deserializationContext) throws IOException {
        String dateStr = null;
        String timeStr = null;
        String fieldName = null;
        dateStr = jsonParser.getValueAsString();
        if (dateStr != null) {
            return LocalDateTime.parse(dateStr, formatter);
        return null;
You can write a deserializer as below.
public class MyDateTimeSerializer extends JsonSerializer<LocalDateTime> {
    private static DateTimeFormatter formatter = ISODateTimeFormat.dateTime();
    @Override
    public void serialize(final DateTime dateTime,
                          final JsonGenerator jsonGenerator, 
                          final SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeString(formatter.print(dateTime));
Now you can annotate your datetime fields as below.
@JsonSerialize(using = MyDateTimeSerializer.class)
@JsonDeserialize(using = MyDateTimeDeserializer.class)
private LocalDateTime valid_to;
        
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