diff --git a/src/main/repository/NoteRepository.ts b/src/main/repository/NoteRepository.ts
index e74cbd1..5d73883 100644
--- a/src/main/repository/NoteRepository.ts
+++ b/src/main/repository/NoteRepository.ts
@@ -1,7 +1,7 @@
 import type Database from 'better-sqlite3';
 import { v7 as uuidv7, v4 as uuidv4 } from 'uuid';
 import type { AiStatus, Note, NoteMedia, NoteRevision, NoteStatus, NoteTag } from '@shared/types';
-import { kstTodayIso } from '../../shared/util/kstDate.js';
+import { kstTodayIso, KST_OFFSET_MS } from '../../shared/util/kstDate.js';
 import { sanitizeFtsQuery, computeCutoff, type ReviewPeriod } from './ftsHelpers.js';
 
 export interface CreateNoteInput {
@@ -1039,7 +1039,6 @@ export class NoteRepository {
    * and count rows whose UTC ISO `created_at` lies inside.
    */
   countToday(now: Date = new Date()): number {
-    const KST_OFFSET_MS = 9 * 60 * 60 * 1000;
     const kstNow = new Date(now.getTime() + KST_OFFSET_MS);
     const kstYear = kstNow.getUTCFullYear();
     const kstMonth = kstNow.getUTCMonth();
diff --git a/src/main/repository/ftsHelpers.ts b/src/main/repository/ftsHelpers.ts
index 47ccac0..f81ac5d 100644
--- a/src/main/repository/ftsHelpers.ts
+++ b/src/main/repository/ftsHelpers.ts
@@ -2,6 +2,8 @@
  * v0.2.11 Cut D — FTS5 검색 + 회고 view 의 순수 함수 헬퍼.
  */
 
+import { KST_OFFSET_MS } from '../../shared/util/kstDate.js';
+
 const FTS5_SPECIAL_CHARS_RE = /["*():]/g;
 const WS_COLLAPSE_RE = /\s+/g;
 
@@ -15,8 +17,6 @@ export function sanitizeFtsQuery(input: string): string {
 
 export type ReviewPeriod = 'daily' | 'weekly' | 'monthly';
 
-const KST_OFFSET_MS = 9 * 60 * 60 * 1000;
-
 /**
  * 회고 cutoff = period 시작점의 KST 자정 (UTC ISO).
  * daily = 오늘 0시, weekly = 7일 전 0시, monthly = 30일 전 0시.
diff --git a/src/main/services/BackupService.ts b/src/main/services/BackupService.ts
index 6e60a0b..cb0a7c7 100644
--- a/src/main/services/BackupService.ts
+++ b/src/main/services/BackupService.ts
@@ -2,8 +2,7 @@ import type Database from 'better-sqlite3';
 import { mkdir, rename, stat, readdir, unlink, readFile, writeFile } from 'node:fs/promises';
 import { join } from 'node:path';
 import { applyGfsRetention } from './backupRotation.js';
-
-const KST_OFFSET_MS = 9 * 60 * 60 * 1000;
+import { KST_OFFSET_MS } from '../../shared/util/kstDate.js';
 const MARKER_FILENAME = '.last-snapshot';
 
 function toKstDateKey(d: Date): string {
diff --git a/src/main/services/ContinuityService.ts b/src/main/services/ContinuityService.ts
index 54e4263..9d0a4ec 100644
--- a/src/main/services/ContinuityService.ts
+++ b/src/main/services/ContinuityService.ts
@@ -1,7 +1,6 @@
 import type Database from 'better-sqlite3';
 import type { WeeklyContinuity } from '@shared/types';
-
-const KST_OFFSET_MS = 9 * 60 * 60 * 1000;
+import { KST_OFFSET_MS } from '../../shared/util/kstDate.js';
 const ONE_DAY_MS = 24 * 60 * 60 * 1000;
 const WEEK_TARGET = 7;
 const RECOVERY_GAP_DAYS = 7;
diff --git a/src/renderer/inbox/components/NoteCard.tsx b/src/renderer/inbox/components/NoteCard.tsx
index 763d812..64e8d49 100644
--- a/src/renderer/inbox/components/NoteCard.tsx
+++ b/src/renderer/inbox/components/NoteCard.tsx
@@ -1,5 +1,6 @@
 import React, { useState } from 'react';
 import type { Note, NoteStatus } from '@shared/types';
+import { KST_OFFSET_MS } from '@shared/util/kstDate.js';
 import { inboxApi } from '../api.js';
 import { useInbox } from '../store.js';
 import { EditableField } from './EditableField.js';
@@ -27,7 +28,6 @@ function isPastDue(iso: string, today: string): boolean {
 }
 
 function todayKstIso(): string {
-  const KST_OFFSET_MS = 9 * 60 * 60 * 1000;
   const k = new Date(Date.now() + KST_OFFSET_MS);
   return k.toISOString().slice(0, 10);
 }