refactor:notice 날짜 포맷팅 수정

src/main/java/com/gamzabat/algohub/common/DateFormatUtil.java

@@ -14,4 +14,9 @@ public static String formatDateTime(LocalDateTime dateTime) {
 		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy.MM.dd HH:mm:ss");
 		return dateTime.format(formatter);
 	}
+
+	public static String formatDateTimeForNotice(LocalDateTime dateTime) {
+		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yy/MM/dd HH:mm a");
+		return dateTime.format(formatter);
+	}
 }

src/main/java/com/gamzabat/algohub/feature/notice/dto/GetNoticeResponse.java

@@ -21,7 +21,7 @@ public static GetNoticeResponse toDTO(Notice notice, boolean isRead) {
 			.title(notice.getTitle())
 			.content(notice.getContent())
 			.category(notice.getCategory())
-			.createAt(DateFormatUtil.formatDate(notice.getCreatedAt().toLocalDate()))
+			.createAt(DateFormatUtil.formatDateTimeForNotice(notice.getCreatedAt()))
 			.isRead(isRead)
 			.build();
 	}

src/main/java/com/gamzabat/algohub/feature/notice/service/NoticeService.java

@@ -80,7 +80,7 @@ public GetNoticeResponse getNotice(@AuthedUser User user, Long noticeId) {
 			.title(notice.getTitle())
 			.content(notice.getContent())
 			.category(notice.getCategory())
-			.createAt(DateFormatUtil.formatDate(notice.getCreatedAt().toLocalDate()))
+			.createAt(DateFormatUtil.formatDateTimeForNotice(notice.getCreatedAt()))
 			.isRead(true)
 			.build();
 	}

src/test/java/com/gamzabat/algohub/service/NoticeServiceTest.java

@@ -185,7 +185,7 @@ void getNoticeSuccess_1() {
 		assertThat(response.content()).isEqualTo("content");
 		assertThat(response.title()).isEqualTo("title");
 		assertThat(response.category()).isEqualTo("category");
-		assertThat(response.createAt()).isEqualTo(DateFormatUtil.formatDate(LocalDateTime.now().toLocalDate()));
+		assertThat(response.createAt()).isEqualTo(DateFormatUtil.formatDateTimeForNotice(notice.getCreatedAt()));
 		assertThat(response.noticeId()).isEqualTo(1000L);
 		verify(noticeReadRepository, times(1)).save(any(NoticeRead.class));
 	}