diff --git a/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Board.java b/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Board.java
index e4fba11..0f7d34a 100644
--- a/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Board.java
+++ b/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Board.java
@@ -40,9 +40,11 @@ public class Board {
     @Column(nullable = true)
     private int viewCount;
 
+    @Column(columnDefinition = "TIMESTAMP")
     @CreatedDate
     LocalDateTime createdAt;
 
+    @Column(columnDefinition = "TIMESTAMP")
     @LastModifiedDate
     LocalDateTime modifiedAt;
 
diff --git a/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Comment.java b/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Comment.java
index 9bd6361..9887128 100644
--- a/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Comment.java
+++ b/backend/src/main/java/com/edufocus/edufocus/board/entity/vo/Comment.java
@@ -9,6 +9,8 @@ import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
 
 import java.time.LocalDateTime;
 
@@ -26,10 +28,12 @@ public class Comment {
     @Column(columnDefinition = "TEXT", nullable = false)
     private String content;
 
-    @Column
+    @Column(columnDefinition = "TIMESTAMP")
+    @CreatedDate
     private LocalDateTime createdAt;
 
-    @Column
+    @Column(columnDefinition = "TIMESTAMP")
+    @LastModifiedDate
     private LocalDateTime modifiedAt;
 
     @ManyToOne
diff --git a/backend/src/main/java/com/edufocus/edufocus/report/controller/ReportController.java b/backend/src/main/java/com/edufocus/edufocus/report/controller/ReportController.java
index 3dfda46..ec1c747 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/controller/ReportController.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/controller/ReportController.java
@@ -64,9 +64,6 @@ public class ReportController {
         return new ResponseEntity<>(detailReport, HttpStatus.OK);
     }
 
-
-
-
     @GetMapping("/teacher/reportSet/{lectureId}")
     public ResponseEntity<List<ReportSetResponse>> searchReportSets(@PathVariable("lectureId") long lectureId){
         List<ReportSetResponse> reportSetResponses = reportService.findReportSets(lectureId);
diff --git a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java
index c588112..9205532 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/Report.java
@@ -30,6 +30,7 @@ public class Report {
 
     private int correctCount;
 
+    @Column(columnDefinition = "TIMESTAMP")
     @CreatedDate
     private LocalDateTime testAt;
 
diff --git a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
index 5ff6b88..7f8f691 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
@@ -34,6 +34,7 @@ public class ReportSet {
     )
     private UUID id;
 
+    @Column(columnDefinition = "TIMESTAMP")
     @CreatedDate
     private LocalDateTime createAt;