LocalDateTest.java

import lombok.AllArgsConstructor;
import lombok.Data;

@AllArgsConstructor
public @Data class LocalDateTest {

	
	public String name = "";
	
	public LocalDateTimeYMD timeYmd;
}

LocalDateTimeYMD.java

import java.time.LocalDateTime;

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import lombok.experimental.Delegate;



@JsonSerialize(using = LocalDateTimeYMDSerializer.class)
@JsonDeserialize(using = LocalDateTimeYMDDeSerializer.class)
public class LocalDateTimeYMD {
	
	@Delegate LocalDateTime date;
	
	public LocalDateTimeYMD(LocalDateTime dateTime){
		this.date = dateTime;
	}
	
	public LocalDateTime getDate(){
		return this.date;
	}
	
}

LocalDateTimeYMDDeSerializer.java

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

public class LocalDateTimeYMDDeSerializer extends JsonDeserializer<LocalDateTimeYMD> {

	@Override
	public LocalDateTimeYMD deserialize(JsonParser p,
			DeserializationContext ctxt)
			throws IOException, JsonProcessingException {
		
		String text = p.getText();
		
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
		
		return new LocalDateTimeYMD(LocalDateTime.parse(text, formatter));
	}
	
}

LocalDateTimeYMDSerializer.java

import java.io.IOException;
import java.time.format.DateTimeFormatter;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

public class LocalDateTimeYMDSerializer extends JsonSerializer<LocalDateTimeYMD> {

	@Override
	public void serialize(LocalDateTimeYMD value, JsonGenerator gen,
			SerializerProvider serializers)
			throws IOException, JsonProcessingException {
		
		
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
		
		gen.writeString(value.getDate().format(formatter));
		
	}


	
}

Test.java

public class Test {

	
	
	public static void main(String ...  args) throws IOException {
		
		ObjectMapper om = new ObjectMapper();
		
		
		LocalDateTimeYMD localDateYmd = new LocalDateTimeYMD(LocalDateTime.now());
		
		// java object
		LocalDateTest localDateTest1 = new LocalDateTest("test", localDateYmd);
		
		// serialized json str
		String serializedJsonStr = om.writeValueAsString(localDateTest1);
		
		System.out.println(serializedJsonStr);
		
		// deserialized java object
		LocalDateTest localDateTest2 = om.readValue(serializedJsonStr, LocalDateTest.class);
		
		
		
		System.out.println(localDateTest1.getTimeYmd().getDate());
		System.out.println(localDateTest2.getTimeYmd().getDate());
		
		
		
	}
	
}