diff --git a/frontend/src/pages/mobile/public/ScheduleDetail.jsx b/frontend/src/pages/mobile/public/ScheduleDetail.jsx
index a2cfcb2..6df9243 100644
--- a/frontend/src/pages/mobile/public/ScheduleDetail.jsx
+++ b/frontend/src/pages/mobile/public/ScheduleDetail.jsx
@@ -5,6 +5,7 @@ import { motion, AnimatePresence } from 'framer-motion';
 import { Calendar, Clock, ChevronLeft, Check, Link2, MapPin, Navigation, ExternalLink, X, ChevronRight } from 'lucide-react';
 import Linkify from 'react-linkify';
 import { getSchedule } from '../../../api/public/schedules';
+import { formatXDateTime } from '../../../utils/date';
 import '../../../mobile.css';
 
 // 카카오맵 SDK 키
@@ -177,26 +178,6 @@ const extractXUsername = (url) => {
     return match ? match[1] : null;
 };
 
-// X용 날짜/시간 포맷팅 (오후 2:30 · 2026년 1월 15일)
-const formatXDateTime = (dateStr, timeStr) => {
-    if (!dateStr) return '';
-    const date = new Date(dateStr);
-    const year = date.getFullYear();
-    const month = date.getMonth() + 1;
-    const day = date.getDate();
-
-    let result = `${year}년 ${month}월 ${day}일`;
-
-    if (timeStr) {
-        const [hours, minutes] = timeStr.split(':').map(Number);
-        const period = hours < 12 ? '오전' : '오후';
-        const hour12 = hours === 0 ? 12 : hours > 12 ? hours - 12 : hours;
-        result = `${period} ${hour12}:${String(minutes).padStart(2, '0')} · ${result}`;
-    }
-
-    return result;
-};
-
 // 유튜브 섹션 컴포넌트
 function YoutubeSection({ schedule }) {
     const videoId = extractYoutubeVideoId(schedule.source?.url);
@@ -367,21 +348,6 @@ function XSection({ schedule }) {
         </a>
     );
 
-    // datetime 포맷팅
-    const formatDateTime = (datetime) => {
-        if (!datetime) return '';
-        const [datePart, timePart] = datetime.split(' ');
-        const [year, month, day] = datePart.split('-').map(Number);
-        let timeStr = '';
-        if (timePart) {
-            const [hour, minute] = timePart.split(':').map(Number);
-            const period = hour >= 12 ? '오후' : '오전';
-            const hour12 = hour > 12 ? hour - 12 : hour === 0 ? 12 : hour;
-            timeStr = `${period} ${hour12}:${String(minute).padStart(2, '0')} · `;
-        }
-        return `${timeStr}${year}년 ${month}월 ${day}일`;
-    };
-
     return (
         <>
         <motion.div
@@ -463,7 +429,7 @@ function XSection({ schedule }) {
             {/* 날짜/시간 */}
             <div className="px-4 py-3 border-t border-gray-100">
                 <span className="text-gray-500 text-sm">
-                    {formatDateTime(schedule.datetime)}
+                    {formatXDateTime(schedule.datetime)}
                 </span>
             </div>
 
diff --git a/frontend/src/pages/pc/public/schedule-sections/XSection.jsx b/frontend/src/pages/pc/public/schedule-sections/XSection.jsx
index 692aa2b..7da1278 100644
--- a/frontend/src/pages/pc/public/schedule-sections/XSection.jsx
+++ b/frontend/src/pages/pc/public/schedule-sections/XSection.jsx
@@ -3,24 +3,7 @@ import { motion } from 'framer-motion';
 import Linkify from 'react-linkify';
 import { decodeHtmlEntities } from './utils';
 import Lightbox from '../../../../components/common/Lightbox';
-
-// datetime 포맷팅 (2026-01-18 19:00 → 오후 7:00 · 2026년 1월 18일)
-const formatXDateTime = (datetime) => {
-    if (!datetime) return '';
-
-    const [datePart, timePart] = datetime.split(' ');
-    const [year, month, day] = datePart.split('-').map(Number);
-
-    let timeStr = '';
-    if (timePart) {
-        const [hour, minute] = timePart.split(':').map(Number);
-        const period = hour >= 12 ? '오후' : '오전';
-        const hour12 = hour > 12 ? hour - 12 : hour === 0 ? 12 : hour;
-        timeStr = `${period} ${hour12}:${String(minute).padStart(2, '0')} · `;
-    }
-
-    return `${timeStr}${year}년 ${month}월 ${day}일`;
-};
+import { formatXDateTime } from '../../../../utils/date';
 
 // X(트위터) 섹션 컴포넌트
 function XSection({ schedule }) {
@@ -39,10 +22,6 @@ function XSection({ schedule }) {
         window.history.pushState({ lightbox: true }, '');
     }, []);
 
-    const closeLightbox = useCallback(() => {
-        setLightboxOpen(false);
-    }, []);
-
     // 뒤로가기 처리
     useEffect(() => {
         const handlePopState = () => {
diff --git a/frontend/src/utils/date.js b/frontend/src/utils/date.js
index 3367fbb..04446da 100644
--- a/frontend/src/utils/date.js
+++ b/frontend/src/utils/date.js
@@ -77,5 +77,30 @@ export const isToday = (date) => {
   return isSameDay(date, dayjs());
 };
 
+/**
+ * X(트위터) 스타일 날짜/시간 포맷팅
+ * 입력: "2026-01-18 19:00" 또는 "2026-01-18"
+ * 출력: "오후 7:00 · 2026년 1월 18일" 또는 "2026년 1월 18일"
+ * @param {string} datetime - 날짜/시간 문자열
+ * @returns {string} 포맷된 문자열
+ */
+export const formatXDateTime = (datetime) => {
+  if (!datetime) return '';
+
+  const d = dayjs(datetime).tz(KST);
+  const datePart = d.format('YYYY년 M월 D일');
+
+  // 시간이 포함된 경우
+  if (datetime.includes(' ') || datetime.includes('T')) {
+    const hour = d.hour();
+    const minute = d.minute();
+    const period = hour >= 12 ? '오후' : '오전';
+    const hour12 = hour > 12 ? hour - 12 : hour === 0 ? 12 : hour;
+    return `${period} ${hour12}:${String(minute).padStart(2, '0')} · ${datePart}`;
+  }
+
+  return datePart;
+};
+
 // dayjs 인스턴스도 export (고급 사용용)
 export { dayjs };