refactor: objectMapper의 모듈 JavaTimeModule로 교체

src/main/java/com/gdschongik/gdsc/global/config/ObjectMapperConfig.java

@@ -12,7 +12,7 @@
 import com.fasterxml.jackson.databind.JsonSerializer;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializerProvider;
-import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import java.io.IOException;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
@@ -28,7 +28,7 @@ public class ObjectMapperConfig {
     @Bean
     public ObjectMapper objectMapper() {
         ObjectMapper mapper = new ObjectMapper();
-        SimpleModule module = new SimpleModule();
+        JavaTimeModule module = new JavaTimeModule();
 
         // LocalDate
         module.addSerializer(LocalDate.class, new LocalDateSerializer());
@@ -43,6 +43,7 @@ public ObjectMapper objectMapper() {
         module.addDeserializer(LocalTime.class, new LocalTimeDeserializer());
 
         // ZonedDateTime
+        module.addSerializer(ZonedDateTime.class, new ZonedDateTimeSerializer());
         module.addDeserializer(ZonedDateTime.class, new ZonedDateTimeDeserializer());
 
         mapper.registerModule(module);
@@ -114,6 +115,15 @@ public LocalTime deserialize(JsonParser jsonParser, DeserializationContext deser
         }
     }
 
+    public class ZonedDateTimeSerializer extends JsonSerializer<ZonedDateTime> {
+        @Override
+        public void serialize(ZonedDateTime value, JsonGenerator generator, SerializerProvider serializers)
+                throws IOException {
+            generator.writeString(
+                    value.format(DateTimeFormatter.ofPattern(DATETIME).withZone(ZoneId.of("Asia/Seoul"))));
+        }
+    }
+
     public class ZonedDateTimeDeserializer extends JsonDeserializer<ZonedDateTime> {
         @Override
         public ZonedDateTime deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)