diff --git a/team1/src/main/java/com/example/demo/entity/Book_collectionEntity.java b/team1/src/main/java/com/example/demo/entity/Book_collectionEntity.java
index b761192..6ad4464 100644
--- a/team1/src/main/java/com/example/demo/entity/Book_collectionEntity.java
+++ b/team1/src/main/java/com/example/demo/entity/Book_collectionEntity.java
@@ -1,6 +1,6 @@
 package com.example.demo.entity;
  
-import java.sql.Date;
+import java.sql.Timestamp;
 
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
@@ -9,6 +9,8 @@ import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 import jakarta.persistence.Table;
 
+import org.springframework.data.annotation.LastModifiedDate;
+
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
@@ -57,7 +59,8 @@ public class Book_collectionEntity {
 	
 	//更新日
     @Column(name = "date_update", nullable = false)
-    private Date dateUpdate;
+    @LastModifiedDate
+    private Timestamp dateUpdate;
     
 //	public static Book_collection convertFrom(Book_collection book_collection) {
 //    // 値を既に持ったインスタンスの生成に、コンストラクタを使用するとこうなります。
diff --git a/team1/src/main/java/com/example/demo/entity/Borrow_booksEntity.java b/team1/src/main/java/com/example/demo/entity/Borrow_booksEntity.java
index 221eb02..d19a28d 100644
--- a/team1/src/main/java/com/example/demo/entity/Borrow_booksEntity.java
+++ b/team1/src/main/java/com/example/demo/entity/Borrow_booksEntity.java
@@ -10,6 +10,7 @@ import jakarta.persistence.GenerationType;
 import jakarta.persistence.Id;
 
 import org.hibernate.annotations.Audited.Table;
+import org.springframework.data.annotation.LastModifiedDate;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
@@ -97,5 +98,6 @@ public class Borrow_booksEntity {
 	 * 更新日
 	 * */
 	@Column(name = "date_update", nullable = false)
+	@LastModifiedDate
 	private Timestamp dateUpdate;
 }