fix : LocalDateTime -> ZoneDateTime because API DOC need **ISO8601** Formatting

src/main/java/com/io/realworld/RealworldApplication.java

@@ -5,10 +5,18 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.web.servlet.ServletComponentScan;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
+import javax.annotation.PostConstruct;
+import java.util.TimeZone;
+
 @SpringBootApplication
 public class RealworldApplication {
+    @PostConstruct
+    public void setTimeZone() {
+        TimeZone.setDefault(TimeZone.getTimeZone("Asia/Seoul"));
+    }
 
     public static void main(String[] args) {
+
         SpringApplication.run(RealworldApplication.class, args);
     }
 

src/main/java/com/io/realworld/base/entity/DateEntity.java

@@ -1,24 +1,36 @@
 package com.io.realworld.base.entity;
 
 import lombok.Getter;
+import lombok.Setter;
 import org.springframework.data.annotation.CreatedDate;
 import org.springframework.data.annotation.LastModifiedDate;
 import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 
-import javax.persistence.Entity;
-import javax.persistence.EntityListeners;
-import javax.persistence.MappedSuperclass;
-import java.time.LocalDateTime;
+import javax.persistence.*;
+import java.time.ZonedDateTime;
+
 
 @Getter
+@Setter
 @MappedSuperclass
-@EntityListeners(AuditingEntityListener.class)
 public class DateEntity {
 
-    @CreatedDate
-    private LocalDateTime createdDate;
+    @Column(name = "created_at")
+    private ZonedDateTime createdDate;
+
+    @Column(name = "update_at")
+    private ZonedDateTime modifiedDate;
+
+    @PrePersist
+    void prePersist() {
+        this.createdDate = ZonedDateTime.now();
+        this.modifiedDate = ZonedDateTime.now();
+    }
+
+    @PreUpdate
+    void preUpdate() {
+        createdDate = ZonedDateTime.now();
+    }
 
-    @LastModifiedDate
-    private LocalDateTime modifiedDate;
 
 }

src/main/java/com/io/realworld/domain/aggregate/article/dto/ArticleResponse.java

@@ -7,6 +7,7 @@ import lombok.Builder;
 import lombok.Getter;
 
 import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
 import java.util.List;
 
 @Builder
@@ -20,8 +21,8 @@ public class ArticleResponse {
     private String body;
 
     private List<String> tagList;
-    private LocalDateTime createdAt;
-    private LocalDateTime updatedAt;
+    private ZonedDateTime createdAt;
+    private ZonedDateTime updatedAt;
 
     private Boolean favorited;
     private Long favoritesCount;

src/main/java/com/io/realworld/domain/aggregate/article/dto/CommentResponse.java

@@ -6,6 +6,7 @@ import lombok.Builder;
 import lombok.Getter;
 
 import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
 
 @Builder
 @Getter
@@ -13,8 +14,8 @@ import java.time.LocalDateTime;
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.WRAPPER_OBJECT)
 public class CommentResponse {
     private Long id;
-    private LocalDateTime createAt;
-    private LocalDateTime updateAt;
+    private ZonedDateTime createAt;
+    private ZonedDateTime updateAt;
     private String body;
 
     private Author author;

src/main/java/com/io/realworld/domain/aggregate/article/service/ArticleServiceImpl.java

@@ -24,6 +24,7 @@ import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;

src/main/resources/application.properties

@@ -10,6 +10,7 @@ spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
 spring.jpa.hibernate.ddl-auto=create
 spring.jpa.properties.hibernate.format_sql=true
 spring.jpq.show-sql=true
+
 #secret
 
 real-world.token.expiry=3000000

src/test/java/com/io/realworld/domain/aggregate/article/repository/CommentRepositoryTest.java

@@ -14,6 +14,7 @@ import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
 import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
 import java.util.List;
 import java.util.Optional;
 
@@ -41,7 +42,7 @@ class CommentRepositoryTest {
 
     private User user;
     private Article article;
-    private LocalDateTime beforeCreated;
+    private ZonedDateTime beforeCreated;
 
     @BeforeEach
     void setup(){
@@ -56,7 +57,7 @@ class CommentRepositoryTest {
 
         String title = "create title";
         String slug = initSlug(title);
-        beforeCreated = LocalDateTime.now();
+        beforeCreated = ZonedDateTime.now();
         article = Article.builder()
                 .author(user)
                 .body("create body")