refactor: TimeUtils 추가

src/main/java/space/space_spring/entity/ChatRoom.java

@@ -51,13 +51,6 @@ public void updateName(String name) {
         this.name = name;
     }
 
-    public LocalDateTime getEncodedTime() {
-        return this.getCreatedAt()
-                .atZone(ZoneId.of("UTC")) // UTC로 해석
-                .withZoneSameInstant(ZoneId.of("Asia/Seoul")) // 서울 시간대로 변환
-                .toLocalDateTime(); // LocalDateTime으로 변환
-    }
-
     //    // 양방향 매핑
 //    @OneToMany(mappedBy = "chatRoom", cascade = CascadeType.ALL)
 //    private List<UserChatRoom> userChatRooms;

src/main/java/space/space_spring/entity/UserChatRoom.java

@@ -9,7 +9,6 @@
 import org.hibernate.annotations.Comment;
 
 import java.time.LocalDateTime;
-import java.time.ZoneId;
 
 @Entity
 @Getter
@@ -52,13 +51,6 @@ public void setLastReadTime(LocalDateTime lastReadTime) {
         this.lastReadTime = lastReadTime;
     }
 
-    public LocalDateTime getEncodedTime() {
-        return this.getLastReadTime()
-                .atZone(ZoneId.of("UTC")) // UTC로 해석
-                .withZoneSameInstant(ZoneId.of("Asia/Seoul")) // 서울 시간대로 변환
-                .toLocalDateTime();
-    }
-
     public void setUserRejoin() {
         this.setLastReadTime(LocalDateTime.now());
         this.updateActive();

src/main/java/space/space_spring/util/TimeUtils.java

@@ -0,0 +1,20 @@
+package space.space_spring.util;
+
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+
+@Component
+public class TimeUtils {
+
+    /**
+     * UTC 시간을 서울 시간으로 변환
+     */
+    public LocalDateTime getEncodedTime(LocalDateTime originalTime) {
+        return originalTime
+            .atZone(ZoneId.of("UTC"))
+            .withZoneSameInstant(ZoneId.of("Asia/Seoul"))
+            .toLocalDateTime();
+    }
+}