diff --git a/src/components/AddTransactionButton.tsx b/src/components/AddTransactionButton.tsx
index 03dc537..b692275 100644
--- a/src/components/AddTransactionButton.tsx
+++ b/src/components/AddTransactionButton.tsx
@@ -8,6 +8,7 @@ import { supabase } from '@/lib/supabase';
 import { isSyncEnabled } from '@/utils/syncUtils';
 import ExpenseForm, { ExpenseFormValues } from './expenses/ExpenseForm';
 import { Transaction } from '@/components/TransactionCard';
+import { normalizeDate } from '@/utils/sync/transaction/dateUtils';
 
 const AddTransactionButton = () => {
   const [showExpenseDialog, setShowExpenseDialog] = useState(false);
@@ -53,11 +54,14 @@ const AddTransactionButton = () => {
         const { data: { user } } = await supabase.auth.getUser();
         
         if (isSyncEnabled() && user) {
+          // ISO 형식으로 날짜 변환
+          const isoDate = normalizeDate(formattedDate);
+          
           const { error } = await supabase.from('transactions').insert({
             user_id: user.id,
             title: data.title,
             amount: parseInt(numericAmount),
-            date: formattedDate,
+            date: isoDate, // ISO 형식 사용
             category: data.category,
             type: 'expense',
             transaction_id: newExpense.id
diff --git a/src/hooks/transactions/supabaseUtils.ts b/src/hooks/transactions/supabaseUtils.ts
index 6993cd9..79cb653 100644
--- a/src/hooks/transactions/supabaseUtils.ts
+++ b/src/hooks/transactions/supabaseUtils.ts
@@ -3,6 +3,45 @@ import { Transaction } from '@/components/TransactionCard';
 import { supabase } from '@/lib/supabase';
 import { isSyncEnabled } from '@/utils/syncUtils';
 import { useAuth } from '@/contexts/auth/AuthProvider';
+import { formatISO, parseISO } from 'date-fns';
+
+// ISO 형식으로 날짜 변환 (Supabase 저장용)
+const convertDateToISO = (dateStr: string): string => {
+  try {
+    // 이미 ISO 형식인 경우 그대로 반환
+    if (dateStr.match(/^\d{4}-\d{2}-\d{2}T/)) {
+      return dateStr;
+    }
+
+    // "오늘, 시간" 형식 처리
+    if (dateStr.includes('오늘')) {
+      const today = new Date();
+      
+      // 시간 추출 시도
+      const timeMatch = dateStr.match(/(\d{1,2}):(\d{2})/);
+      if (timeMatch) {
+        const hours = parseInt(timeMatch[1], 10);
+        const minutes = parseInt(timeMatch[2], 10);
+        today.setHours(hours, minutes, 0, 0);
+      }
+      
+      return formatISO(today);
+    }
+    
+    // 일반 날짜 문자열은 그대로 Date 객체로 변환 시도
+    const date = new Date(dateStr);
+    if (!isNaN(date.getTime())) {
+      return formatISO(date);
+    }
+    
+    // 변환 실패 시 현재 시간 반환
+    console.warn(`날짜 변환 오류: "${dateStr}"를 ISO 형식으로 변환할 수 없습니다.`);
+    return formatISO(new Date());
+  } catch (error) {
+    console.error(`날짜 변환 오류: "${dateStr}"`, error);
+    return formatISO(new Date());
+  }
+};
 
 // Supabase와 트랜잭션 동기화
 export const syncTransactionsWithSupabase = async (user: any, transactions: Transaction[]): Promise<Transaction[]> => {
@@ -56,12 +95,15 @@ export const updateTransactionInSupabase = async (user: any, transaction: Transa
   if (!user || !isSyncEnabled()) return;
   
   try {
+    // 날짜를 ISO 형식으로 변환
+    const isoDate = convertDateToISO(transaction.date);
+    
     const { error } = await supabase.from('transactions')
       .upsert({
         user_id: user.id,
         title: transaction.title,
         amount: transaction.amount,
-        date: transaction.date,
+        date: isoDate, // ISO 형식 사용
         category: transaction.category,
         type: transaction.type,
         transaction_id: transaction.id
@@ -69,6 +111,8 @@ export const updateTransactionInSupabase = async (user: any, transaction: Transa
       
     if (error) {
       console.error('트랜잭션 업데이트 오류:', error);
+    } else {
+      console.log('Supabase 트랜잭션 업데이트 성공:', transaction.id);
     }
   } catch (error) {
     console.error('Supabase 업데이트 오류:', error);
@@ -86,6 +130,8 @@ export const deleteTransactionFromSupabase = async (user: any, transactionId: st
       
     if (error) {
       console.error('트랜잭션 삭제 오류:', error);
+    } else {
+      console.log('Supabase 트랜잭션 삭제 성공:', transactionId);
     }
   } catch (error) {
     console.error('Supabase 삭제 오류:', error);
diff --git a/src/hooks/transactions/transactionOperations/deleteOperation/deleteTransactionStorage.ts b/src/hooks/transactions/transactionOperations/deleteOperation/deleteTransactionStorage.ts
index e299e10..5868e1c 100644
--- a/src/hooks/transactions/transactionOperations/deleteOperation/deleteTransactionStorage.ts
+++ b/src/hooks/transactions/transactionOperations/deleteOperation/deleteTransactionStorage.ts
@@ -4,6 +4,7 @@ import { Transaction } from '@/components/TransactionCard';
 import { saveTransactionsToStorage } from '../../storageUtils';
 import { deleteTransactionFromSupabase } from '../../supabaseUtils';
 import { toast } from '@/hooks/useToast.wrapper';
+import { normalizeDate } from '@/utils/sync/transaction/dateUtils';
 
 /**
  * 스토리지 및 Supabase 삭제 처리
@@ -31,6 +32,10 @@ export const handleDeleteStorage = (
       // 동기적 에러를 피하기 위해 setTimeout으로 감싸기
       setTimeout(() => {
         try {
+          // ISO 형식으로 날짜 변환
+          const isoDate = normalizeDate(transactionToDelete.date);
+          console.log('삭제 중인 트랜잭션 ISO 날짜:', isoDate);
+          
           deleteTransactionFromSupabase(user, id)
             .catch(error => {
               console.error('Supabase 삭제 오류:', error);
diff --git a/src/hooks/transactions/transactionOperations/updateTransaction.ts b/src/hooks/transactions/transactionOperations/updateTransaction.ts
index c381577..403be73 100644
--- a/src/hooks/transactions/transactionOperations/updateTransaction.ts
+++ b/src/hooks/transactions/transactionOperations/updateTransaction.ts
@@ -6,6 +6,7 @@ import { toast } from '@/hooks/useToast.wrapper';
 import { saveTransactionsToStorage } from '../storageUtils';
 import { updateTransactionInSupabase } from '../supabaseUtils';
 import { TransactionOperationProps } from './types';
+import { normalizeDate } from '@/utils/sync/transaction/dateUtils';
 
 /**
  * 트랜잭션 업데이트 기능
@@ -28,9 +29,15 @@ export const useUpdateTransaction = (
     // 상태 업데이트
     setTransactions(updatedTransactions);
     
-    // Supabase 업데이트 시도
+    // Supabase 업데이트 시도 (날짜 형식 변환 추가)
     if (user) {
-      updateTransactionInSupabase(user, updatedTransaction);
+      // ISO 형식으로 날짜 변환
+      const transactionWithIsoDate = {
+        ...updatedTransaction,
+        dateForSync: normalizeDate(updatedTransaction.date)
+      };
+      
+      updateTransactionInSupabase(user, transactionWithIsoDate);
     }
     
     // 이벤트 발생
diff --git a/src/hooks/transactions/useTransactionsEvents.ts b/src/hooks/transactions/useTransactionsEvents.ts
index 422533d..edcaaf0 100644
--- a/src/hooks/transactions/useTransactionsEvents.ts
+++ b/src/hooks/transactions/useTransactionsEvents.ts
@@ -43,6 +43,20 @@ export const useTransactionsEvents = (
       }, 200);
     };
     
+    // 트랜잭션 변경 이벤트 (통합 이벤트)
+    const handleTransactionChange = (e: CustomEvent) => {
+      console.log('트랜잭션 변경 이벤트 감지:', e.detail?.type);
+      
+      // 처리 중 중복 호출 방지
+      if (isProcessing) return;
+      
+      isProcessing = true;
+      setTimeout(() => {
+        loadTransactions();
+        isProcessing = false;
+      }, 150);
+    };
+    
     // 스토리지 이벤트
     const handleStorageEvent = (e: StorageEvent) => {
       if (e.key === 'transactions' || e.key === null) {
@@ -76,6 +90,7 @@ export const useTransactionsEvents = (
     // 이벤트 리스너 등록
     window.addEventListener('transactionUpdated', handleTransactionUpdate);
     window.addEventListener('transactionDeleted', handleTransactionDelete);
+    window.addEventListener('transactionChanged', handleTransactionChange as EventListener);
     window.addEventListener('storage', handleStorageEvent);
     window.addEventListener('focus', handleFocus);
     
@@ -89,6 +104,7 @@ export const useTransactionsEvents = (
       console.log('useTransactions - 이벤트 리스너 제거');
       window.removeEventListener('transactionUpdated', handleTransactionUpdate);
       window.removeEventListener('transactionDeleted', handleTransactionDelete);
+      window.removeEventListener('transactionChanged', handleTransactionChange as EventListener);
       window.removeEventListener('storage', handleStorageEvent);
       window.removeEventListener('focus', handleFocus);
     };