diff --git a/backend/src/services/meilisearch/index.js b/backend/src/services/meilisearch/index.js
index 3fd0817..65f19e0 100644
--- a/backend/src/services/meilisearch/index.js
+++ b/backend/src/services/meilisearch/index.js
@@ -8,6 +8,7 @@
 import Inko from 'inko';
 import config, { CATEGORY_IDS } from '../../config/index.js';
 import { createLogger } from '../../utils/logger.js';
+import { buildDatetime } from '../schedule.js';
 
 const inko = new Inko();
 const logger = createLogger('Meilisearch');
@@ -122,28 +123,16 @@ export async function searchSchedules(meilisearch, db, query, options = {}) {
 
 /**
  * 검색 결과 응답 형식 변환
+ * schedule.js의 공통 포맷과 동일한 구조 반환
+ * (Meilisearch 인덱스 필드명이 다르므로 별도 매핑 필요)
  */
 function formatScheduleResponse(hit) {
-  // date + time 합치기
-  let datetime = null;
-  if (hit.date) {
-    const dateStr = hit.date instanceof Date
-      ? hit.date.toISOString().split('T')[0]
-      : String(hit.date).split('T')[0];
-
-    if (hit.time) {
-      datetime = `${dateStr}T${hit.time}`;
-    } else {
-      datetime = dateStr;
-    }
-  }
-
   // member_names를 배열로 변환
   const members = hit.member_names
     ? hit.member_names.split(',').map(name => name.trim()).filter(Boolean)
     : [];
 
-  // source 객체 구성 (X는 name 비움)
+  // source 객체 구성 (Meilisearch에는 URL 없음)
   let source = null;
   if (hit.category_id === CATEGORY_IDS.YOUTUBE && hit.source_name) {
     source = { name: hit.source_name, url: null };
@@ -154,7 +143,7 @@ function formatScheduleResponse(hit) {
   return {
     id: hit.id,
     title: hit.title,
-    datetime,
+    datetime: buildDatetime(hit.date, hit.time),
     category: {
       id: hit.category_id,
       name: hit.category_name,
diff --git a/backend/src/services/schedule.js b/backend/src/services/schedule.js
index 1457fb9..b05cb9d 100644
--- a/backend/src/services/schedule.js
+++ b/backend/src/services/schedule.js
@@ -5,6 +5,123 @@
 import config, { CATEGORY_IDS } from '../config/index.js';
 import { getOrSet, cacheKeys, TTL } from '../utils/cache.js';
 
+// ==================== 공통 포맷팅 함수 ====================
+
+/**
+ * 날짜 문자열 정규화
+ * @param {Date|string} date - 날짜
+ * @returns {string} YYYY-MM-DD 형식
+ */
+export function normalizeDate(date) {
+  if (!date) return '';
+  if (date instanceof Date) {
+    return date.toISOString().split('T')[0];
+  }
+  return String(date).split('T')[0];
+}
+
+/**
+ * datetime 생성 (date + time)
+ * @param {Date|string} date - 날짜
+ * @param {string} time - 시간 (HH:mm:ss)
+ * @returns {string} YYYY-MM-DDTHH:mm:ss 또는 YYYY-MM-DD
+ */
+export function buildDatetime(date, time) {
+  const dateStr = normalizeDate(date);
+  return time ? `${dateStr}T${time}` : dateStr;
+}
+
+/**
+ * source 객체 생성
+ * @param {object} schedule - 일정 원본 데이터
+ * @returns {object|null} { name, url } 또는 null
+ */
+export function buildSource(schedule) {
+  const { category_id, youtube_video_id, youtube_video_type, youtube_channel, x_post_id } = schedule;
+
+  if (category_id === CATEGORY_IDS.YOUTUBE && youtube_video_id) {
+    const url = youtube_video_type === 'shorts'
+      ? `https://www.youtube.com/shorts/${youtube_video_id}`
+      : `https://www.youtube.com/watch?v=${youtube_video_id}`;
+    return {
+      name: youtube_channel || 'YouTube',
+      url,
+    };
+  }
+
+  if (category_id === CATEGORY_IDS.X && x_post_id) {
+    return {
+      name: '',
+      url: `https://x.com/${config.x.defaultUsername}/status/${x_post_id}`,
+    };
+  }
+
+  return null;
+}
+
+/**
+ * 단일 일정 포맷팅 (공통)
+ * @param {object} rawSchedule - DB에서 조회한 원본 일정
+ * @param {string[]} members - 멤버 이름 배열
+ * @returns {object} 포맷된 일정 객체
+ */
+export function formatSchedule(rawSchedule, members = []) {
+  return {
+    id: rawSchedule.id,
+    title: rawSchedule.title,
+    datetime: buildDatetime(rawSchedule.date, rawSchedule.time),
+    category: {
+      id: rawSchedule.category_id,
+      name: rawSchedule.category_name,
+      color: rawSchedule.category_color,
+    },
+    source: buildSource(rawSchedule),
+    members,
+  };
+}
+
+/**
+ * 멤버 맵 조회 (일정 ID → 멤버 이름 배열)
+ * @param {object} db - 데이터베이스 연결
+ * @param {number[]} scheduleIds - 일정 ID 배열
+ * @returns {object} { scheduleId: [memberName, ...] }
+ */
+export async function buildMemberMap(db, scheduleIds) {
+  if (!scheduleIds || scheduleIds.length === 0) {
+    return {};
+  }
+
+  const [scheduleMembers] = await db.query(`
+    SELECT sm.schedule_id, m.name
+    FROM schedule_members sm
+    JOIN members m ON sm.member_id = m.id
+    WHERE sm.schedule_id IN (?)
+    ORDER BY m.id
+  `, [scheduleIds]);
+
+  const memberMap = {};
+  for (const sm of scheduleMembers) {
+    if (!memberMap[sm.schedule_id]) {
+      memberMap[sm.schedule_id] = [];
+    }
+    memberMap[sm.schedule_id].push(sm.name);
+  }
+
+  return memberMap;
+}
+
+/**
+ * 일정 목록 포맷팅 (공통)
+ * @param {object[]} rawSchedules - DB에서 조회한 원본 일정 배열
+ * @param {object} memberMap - 멤버 맵
+ * @returns {object[]} 포맷된 일정 배열
+ */
+export function formatSchedules(rawSchedules, memberMap) {
+  return rawSchedules.map(s => formatSchedule(s, memberMap[s.id] || []));
+}
+
+// ==================== 카테고리 ====================
+
 /**
  * 카테고리 목록 조회 (캐시 적용)
  * @param {object} db - 데이터베이스 연결
@@ -25,6 +142,8 @@ export async function getCategories(db, redis = null) {
   return fetchCategories();
 }
 
+// ==================== 일정 상세 ====================
+
 /**
  * 일정 상세 조회
  * @param {object} db - 데이터베이스 연결
@@ -66,16 +185,11 @@ export async function getScheduleDetail(db, id, getXProfile = null) {
     ORDER BY m.id
   `, [id]);
 
-  // datetime 생성 (date + time)
-  const dateStr = s.date instanceof Date ? s.date.toISOString().split('T')[0] : s.date?.split('T')[0];
-  const timeStr = s.time ? s.time.slice(0, 5) : null;
-  const datetime = timeStr ? `${dateStr} ${timeStr}` : dateStr;
-
   // 공통 필드
   const result = {
     id: s.id,
     title: s.title,
-    datetime,
+    datetime: buildDatetime(s.date, s.time),
     category: {
       id: s.category_id,
       name: s.category_name,
@@ -88,7 +202,6 @@ export async function getScheduleDetail(db, id, getXProfile = null) {
 
   // 카테고리별 추가 필드
   if (s.category_id === CATEGORY_IDS.YOUTUBE && s.youtube_video_id) {
-    // YouTube
     result.videoId = s.youtube_video_id;
     result.videoType = s.youtube_video_type;
     result.channelName = s.youtube_channel;
@@ -96,14 +209,12 @@ export async function getScheduleDetail(db, id, getXProfile = null) {
       ? `https://www.youtube.com/shorts/${s.youtube_video_id}`
       : `https://www.youtube.com/watch?v=${s.youtube_video_id}`;
   } else if (s.category_id === CATEGORY_IDS.X && s.x_post_id) {
-    // X (Twitter)
     const username = config.x.defaultUsername;
     result.postId = s.x_post_id;
     result.content = s.x_content || null;
     result.imageUrls = s.x_image_urls ? JSON.parse(s.x_image_urls) : [];
     result.postUrl = `https://x.com/${username}/status/${s.x_post_id}`;
 
-    // 프로필 정보 (선택적)
     if (getXProfile) {
       const profile = await getXProfile(username);
       if (profile) {
@@ -119,62 +230,52 @@ export async function getScheduleDetail(db, id, getXProfile = null) {
   return result;
 }
 
+// ==================== 일정 목록 조회 ====================
+
+/** 일정 목록 조회용 공통 SQL */
+const SCHEDULE_LIST_SQL = `
+  SELECT
+    s.id,
+    s.title,
+    s.date,
+    s.time,
+    s.category_id,
+    c.name as category_name,
+    c.color as category_color,
+    sy.channel_name as youtube_channel,
+    sy.video_id as youtube_video_id,
+    sy.video_type as youtube_video_type,
+    sx.post_id as x_post_id
+  FROM schedules s
+  LEFT JOIN schedule_categories c ON s.category_id = c.id
+  LEFT JOIN schedule_youtube sy ON s.id = sy.schedule_id
+  LEFT JOIN schedule_x sx ON s.id = sx.schedule_id
+`;
+
 /**
  * 월별 일정 조회 (생일 포함)
- * 검색 API와 동일한 형식으로 반환
  * @param {object} db - 데이터베이스 연결
  * @param {number} year - 연도
  * @param {number} month - 월
- * @returns {object} { schedules: [] } 형식의 일정 배열
+ * @returns {object} { schedules: [] }
  */
 export async function getMonthlySchedules(db, year, month) {
   const startDate = `${year}-${String(month).padStart(2, '0')}-01`;
   const endDate = new Date(year, month, 0).toISOString().split('T')[0];
 
-  // 일정 조회 (YouTube, X 소스 정보 포함)
-  const [schedules] = await db.query(`
-    SELECT
-      s.id,
-      s.title,
-      s.date,
-      s.time,
-      s.category_id,
-      c.name as category_name,
-      c.color as category_color,
-      sy.channel_name as youtube_channel,
-      sy.video_id as youtube_video_id,
-      sy.video_type as youtube_video_type,
-      sx.post_id as x_post_id
-    FROM schedules s
-    LEFT JOIN schedule_categories c ON s.category_id = c.id
-    LEFT JOIN schedule_youtube sy ON s.id = sy.schedule_id
-    LEFT JOIN schedule_x sx ON s.id = sx.schedule_id
-    WHERE s.date BETWEEN ? AND ?
-    ORDER BY s.date ASC, s.time ASC
-  `, [startDate, endDate]);
+  // 일정 조회
+  const [rawSchedules] = await db.query(
+    `${SCHEDULE_LIST_SQL} WHERE s.date BETWEEN ? AND ? ORDER BY s.date ASC, s.time ASC`,
+    [startDate, endDate]
+  );
 
-  // 일정 멤버 조회
-  const scheduleIds = schedules.map(s => s.id);
-  let memberMap = {};
+  // 멤버 맵 조회
+  const memberMap = await buildMemberMap(db, rawSchedules.map(s => s.id));
 
-  if (scheduleIds.length > 0) {
-    const [scheduleMembers] = await db.query(`
-      SELECT sm.schedule_id, m.name
-      FROM schedule_members sm
-      JOIN members m ON sm.member_id = m.id
-      WHERE sm.schedule_id IN (?)
-      ORDER BY m.id
-    `, [scheduleIds]);
+  // 일정 포맷팅
+  const schedules = formatSchedules(rawSchedules, memberMap);
 
-    for (const sm of scheduleMembers) {
-      if (!memberMap[sm.schedule_id]) {
-        memberMap[sm.schedule_id] = [];
-      }
-      memberMap[sm.schedule_id].push(sm.name);
-    }
-  }
-
-  // 생일 조회
+  // 생일 조회 및 추가
   const [birthdays] = await db.query(`
     SELECT m.id, m.name, m.name_en, m.birth_date,
            i.thumb_url as image_url
@@ -183,68 +284,16 @@ export async function getMonthlySchedules(db, year, month) {
     WHERE m.is_former = 0 AND MONTH(m.birth_date) = ?
   `, [month]);
 
-  // 결과 배열
-  const result = [];
-
-  // 일정 추가
-  for (const s of schedules) {
-    const dateStr = s.date instanceof Date
-      ? s.date.toISOString().split('T')[0]
-      : s.date;
-
-    // datetime 생성
-    const datetime = s.time ? `${dateStr}T${s.time}` : dateStr;
-
-    // 멤버 이름 배열 (문자열 배열)
-    const members = memberMap[s.id] || [];
-
-    const schedule = {
-      id: s.id,
-      title: s.title,
-      datetime,
-      category: {
-        id: s.category_id,
-        name: s.category_name,
-        color: s.category_color,
-      },
-      source: null,
-      members,
-    };
-
-    // source 정보 추가
-    if (s.category_id === CATEGORY_IDS.YOUTUBE && s.youtube_video_id) {
-      const videoUrl = s.youtube_video_type === 'shorts'
-        ? `https://www.youtube.com/shorts/${s.youtube_video_id}`
-        : `https://www.youtube.com/watch?v=${s.youtube_video_id}`;
-      schedule.source = {
-        name: s.youtube_channel || 'YouTube',
-        url: videoUrl,
-      };
-    } else if (s.category_id === CATEGORY_IDS.X && s.x_post_id) {
-      schedule.source = {
-        name: '',
-        url: `https://x.com/${config.x.defaultUsername}/status/${s.x_post_id}`,
-      };
-    }
-
-    result.push(schedule);
-  }
-
-  // 생일 일정 추가
   for (const member of birthdays) {
     const birthDate = new Date(member.birth_date);
-    const birthYear = birthDate.getFullYear();
+    if (year < birthDate.getFullYear()) continue;
 
-    // 조회 연도가 생년보다 이전이면 스킵
-    if (year < birthYear) continue;
+    const birthdayDate = new Date(year, birthDate.getMonth(), birthDate.getDate());
 
-    const birthdayThisYear = new Date(year, birthDate.getMonth(), birthDate.getDate());
-    const dateKey = birthdayThisYear.toISOString().split('T')[0];
-
-    const birthdaySchedule = {
+    schedules.push({
       id: `birthday-${member.id}`,
       title: `HAPPY ${member.name_en} DAY`,
-      datetime: dateKey,
+      datetime: birthdayDate.toISOString().split('T')[0],
       category: {
         id: CATEGORY_IDS.BIRTHDAY,
         name: '생일',
@@ -254,115 +303,34 @@ export async function getMonthlySchedules(db, year, month) {
       members: [member.name],
       is_birthday: true,
       member_image: member.image_url,
-    };
-
-    result.push(birthdaySchedule);
+    });
   }
 
-  // 날짜 + 시간 순으로 정렬
-  result.sort((a, b) => a.datetime.localeCompare(b.datetime));
+  // 날짜순 정렬
+  schedules.sort((a, b) => a.datetime.localeCompare(b.datetime));
 
-  return { schedules: result };
+  return { schedules };
 }
 
 /**
- * 다가오는 일정 조회 (startDate부터 limit개)
- * 검색 API와 동일한 형식으로 반환
+ * 다가오는 일정 조회
  * @param {object} db - 데이터베이스 연결
  * @param {string} startDate - 시작 날짜
  * @param {number} limit - 조회 개수
- * @returns {object} { schedules: [] } 형식의 일정 배열
+ * @returns {object} { schedules: [] }
  */
 export async function getUpcomingSchedules(db, startDate, limit) {
-  // 일정 조회 (YouTube, X 소스 정보 포함)
-  const [schedules] = await db.query(`
-    SELECT
-      s.id,
-      s.title,
-      s.date,
-      s.time,
-      s.category_id,
-      c.name as category_name,
-      c.color as category_color,
-      sy.channel_name as youtube_channel,
-      sy.video_id as youtube_video_id,
-      sy.video_type as youtube_video_type,
-      sx.post_id as x_post_id
-    FROM schedules s
-    LEFT JOIN schedule_categories c ON s.category_id = c.id
-    LEFT JOIN schedule_youtube sy ON s.id = sy.schedule_id
-    LEFT JOIN schedule_x sx ON s.id = sx.schedule_id
-    WHERE s.date >= ?
-    ORDER BY s.date ASC, s.time ASC
-    LIMIT ?
-  `, [startDate, limit]);
+  // 일정 조회
+  const [rawSchedules] = await db.query(
+    `${SCHEDULE_LIST_SQL} WHERE s.date >= ? ORDER BY s.date ASC, s.time ASC LIMIT ?`,
+    [startDate, limit]
+  );
 
-  // 멤버 정보 조회
-  const scheduleIds = schedules.map(s => s.id);
-  let memberMap = {};
+  // 멤버 맵 조회
+  const memberMap = await buildMemberMap(db, rawSchedules.map(s => s.id));
 
-  if (scheduleIds.length > 0) {
-    const [scheduleMembers] = await db.query(`
-      SELECT sm.schedule_id, m.name
-      FROM schedule_members sm
-      JOIN members m ON sm.member_id = m.id
-      WHERE sm.schedule_id IN (?)
-      ORDER BY m.id
-    `, [scheduleIds]);
+  // 일정 포맷팅
+  const schedules = formatSchedules(rawSchedules, memberMap);
 
-    for (const sm of scheduleMembers) {
-      if (!memberMap[sm.schedule_id]) {
-        memberMap[sm.schedule_id] = [];
-      }
-      memberMap[sm.schedule_id].push(sm.name);
-    }
-  }
-
-  // 결과 배열
-  const result = [];
-
-  for (const s of schedules) {
-    const dateStr = s.date instanceof Date
-      ? s.date.toISOString().split('T')[0]
-      : s.date;
-
-    // datetime 생성
-    const datetime = s.time ? `${dateStr}T${s.time}` : dateStr;
-
-    // 멤버 이름 배열 (문자열 배열)
-    const members = memberMap[s.id] || [];
-
-    const schedule = {
-      id: s.id,
-      title: s.title,
-      datetime,
-      category: {
-        id: s.category_id,
-        name: s.category_name,
-        color: s.category_color,
-      },
-      source: null,
-      members,
-    };
-
-    // source 정보 추가
-    if (s.category_id === CATEGORY_IDS.YOUTUBE && s.youtube_video_id) {
-      const videoUrl = s.youtube_video_type === 'shorts'
-        ? `https://www.youtube.com/shorts/${s.youtube_video_id}`
-        : `https://www.youtube.com/watch?v=${s.youtube_video_id}`;
-      schedule.source = {
-        name: s.youtube_channel || 'YouTube',
-        url: videoUrl,
-      };
-    } else if (s.category_id === CATEGORY_IDS.X && s.x_post_id) {
-      schedule.source = {
-        name: '',
-        url: `https://x.com/${config.x.defaultUsername}/status/${s.x_post_id}`,
-      };
-    }
-
-    result.push(schedule);
-  }
-
-  return { schedules: result };
+  return { schedules };
 }