diff --git a/src/components/NotificationItem/NotificationItem.tsx b/src/components/NotificationItem/NotificationItem.tsx
index c64bb4aa..85988632 100644
--- a/src/components/NotificationItem/NotificationItem.tsx
+++ b/src/components/NotificationItem/NotificationItem.tsx
@@ -1,7 +1,6 @@
 import { Flex } from '@components/shared/Flex';
 import { Text } from '@components/shared/Text';
 
-import { convertUTCToKoreanTime } from '@utils/convertUTCToKoreanTime';
 import { createdAtToString } from '@utils/createdAtToString';
 
 import {
@@ -38,7 +37,7 @@ const NotificationItem = ({
             {title}
           </Text>
           <AgoText size={8} weight={300} nowrap>
-            {createdAtToString(new Date(convertUTCToKoreanTime(createdAt)))}
+            {createdAtToString(new Date(createdAt))}
             {!read && <Badge />}
           </AgoText>
         </Flex>
diff --git a/src/pages/ChatRoomListPage/components/ChatRoomItem.tsx b/src/pages/ChatRoomListPage/components/ChatRoomItem.tsx
index f912235f..a40bf315 100644
--- a/src/pages/ChatRoomListPage/components/ChatRoomItem.tsx
+++ b/src/pages/ChatRoomListPage/components/ChatRoomItem.tsx
@@ -6,7 +6,6 @@ import { ChatRoom } from '@type/models/ChatRoom.ts';
 
 import { CHAT_ROOM_TAB_TITLE } from '@constants/chat.ts';
 
-import { convertUTCToKoreanTime } from '@utils/convertUTCToKoreanTime.ts';
 import { createdAtToString } from '@utils/createdAtToString.ts';
 
 import {
@@ -53,8 +52,6 @@ export const ChatRoomItem = ({
     playTimeMinutes,
   } = chatRoomItem;
 
-  const lastTime = convertUTCToKoreanTime(lastMessageCreatedAt);
-
   return (
     <Flex justify="space-between" onClick={onClickChatRoomItem}>
       <Flex gap={8}>
@@ -80,7 +77,7 @@ export const ChatRoomItem = ({
         </MessageContainer>
       </Flex>
       <DateText size={8} color={theme.PALETTE.GRAY_500} nowrap>
-        {createdAtToString(new Date(lastTime))}
+        {createdAtToString(new Date(lastMessageCreatedAt))}
       </DateText>
     </Flex>
   );
diff --git a/src/pages/ChattingPage/components/Chat.tsx b/src/pages/ChattingPage/components/Chat.tsx
index b7c33060..3e204b4d 100644
--- a/src/pages/ChattingPage/components/Chat.tsx
+++ b/src/pages/ChattingPage/components/Chat.tsx
@@ -8,8 +8,6 @@ import { ChatMessage } from '@type/models/ChatMessage';
 
 import { CHAT_TYPE } from '@constants/chat';
 
-import { convertUTCToKoreanTime } from '@utils/convertUTCToKoreanTime';
-
 import {
   BalloonContainer,
   BalloonInfo,
@@ -59,7 +57,7 @@ export const Chat = ({
           {}
         </Text>
         <Text size={10} weight={300}>
-          {String(convertUTCToKoreanTime(createdAt)).slice(11, 16)}
+          {String(createdAt).slice(11, 16)}
         </Text>
       </BalloonInfo>
     </Flex>
diff --git a/src/pages/ChattingPage/hooks/useChattingPage.ts b/src/pages/ChattingPage/hooks/useChattingPage.ts
index 9423cc0e..26f02569 100644
--- a/src/pages/ChattingPage/hooks/useChattingPage.ts
+++ b/src/pages/ChattingPage/hooks/useChattingPage.ts
@@ -19,7 +19,7 @@ import { CHAT_TYPE } from '@constants/chat';
 import { PATH_NAME } from '@constants/pathName';
 
 import { MODAL_CONTENTS } from '../constants/modalContents';
-import { formatDateString, getKoreanDay } from '../services/formatDate';
+import { formatDateString, getSlicedTime } from '../services/formatDate';
 import { useQuitCondition } from '../services/quitChatCondition';
 import {
   connect,
@@ -75,8 +75,10 @@ export const useChattingPage = () => {
           return [...prevChats, dateSystemMessage, chat];
         }
 
-        const prevCreatedAt = getKoreanDay(prevChatMessages[idx - 1].createdAt);
-        const curCreatedAt = getKoreanDay(chat.createdAt);
+        const prevCreatedAt = getSlicedTime(
+          prevChatMessages[idx - 1].createdAt
+        );
+        const curCreatedAt = getSlicedTime(chat.createdAt);
 
         if (prevCreatedAt !== curCreatedAt) {
           const dateSystemMessage = createDateSystemMessage(chat);
@@ -115,11 +117,11 @@ export const useChattingPage = () => {
           roomId,
           subscribeEvent: (received: ChatMessage) =>
             setChatMessages((prev: ChatMessage[]) => {
-              const prevCreatedAt = getKoreanDay(
+              const prevCreatedAt = getSlicedTime(
                 prev[prev.length - 1].createdAt
               );
 
-              const curCreatedAt = getKoreanDay(received.createdAt);
+              const curCreatedAt = getSlicedTime(received.createdAt);
 
               if (prevCreatedAt !== curCreatedAt) {
                 const dateSystemMessage = createDateSystemMessage(received);
diff --git a/src/pages/ChattingPage/services/formatDate.ts b/src/pages/ChattingPage/services/formatDate.ts
index 97f6149d..d5e25c6b 100644
--- a/src/pages/ChattingPage/services/formatDate.ts
+++ b/src/pages/ChattingPage/services/formatDate.ts
@@ -1,7 +1,5 @@
 import { WEEKDAY } from '@constants/weekday';
 
-import { convertUTCToKoreanTime } from '@utils/convertUTCToKoreanTime';
-
 export const formatDateString = (created: Date) => {
   const date = new Date(created);
   const year = date.getFullYear();
@@ -12,5 +10,4 @@ export const formatDateString = (created: Date) => {
   return `${year}년 ${month}월 ${day}일 ${daysOfWeek}요일`;
 };
 
-export const getKoreanDay = (date: Date) =>
-  String(convertUTCToKoreanTime(date)).slice(0, 10);
+export const getSlicedTime = (date: Date) => String(date).slice(0, 10);
diff --git a/src/pages/NotificationPage/components/GameNotificationItem/getGameNotificationTitle.ts b/src/pages/NotificationPage/components/GameNotificationItem/getGameNotificationTitle.ts
index 4633a4ae..880ed429 100644
--- a/src/pages/NotificationPage/components/GameNotificationItem/getGameNotificationTitle.ts
+++ b/src/pages/NotificationPage/components/GameNotificationItem/getGameNotificationTitle.ts
@@ -2,5 +2,7 @@ export const getGameNotificationTitle = (
   playDate: string,
   mainAddress: string
 ) => {
-  return `${playDate.split('-').slice(1)} ${mainAddress.split(' ')[0]}`;
+  return `${playDate.split('-').slice(1).join('.')} ${
+    mainAddress.split(' ')[0]
+  }`;
 };
diff --git a/src/utils/convertUTCToKoreanTime.ts b/src/utils/convertUTCToKoreanTime.ts
deleted file mode 100644
index b7cc5a5a..00000000
--- a/src/utils/convertUTCToKoreanTime.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-export const convertUTCToKoreanTime = (utcTime: string | Date) => {
-  const utcDate = new Date(utcTime);
-  const offset = utcDate.getTimezoneOffset();
-  const koreanDate = new Date(utcDate.getTime() - offset * 60 * 1000);
-
-  const formattedTime = `${koreanDate.getFullYear()}-${String(
-    koreanDate.getMonth() + 1
-  ).padStart(2, '0')}-${String(koreanDate.getDate()).padStart(2, '0')}T${String(
-    koreanDate.getHours()
-  ).padStart(2, '0')}:${String(koreanDate.getMinutes()).padStart(
-    2,
-    '0'
-  )}:${String(koreanDate.getSeconds()).padStart(2, '0')}`;
-
-  return formattedTime;
-};