diff --git a/src/components/transaction/TransactionForm/TransactionForm.tsx b/src/components/transaction/TransactionForm/TransactionForm.tsx
index 2509bd7..ea7bb34 100644
--- a/src/components/transaction/TransactionForm/TransactionForm.tsx
+++ b/src/components/transaction/TransactionForm/TransactionForm.tsx
@@ -76,7 +76,14 @@ export const TransactionForm: React.FC<TransactionFormProps> = ({
     currency: 'CNY',
     categoryId: 0,
     accountId: 0,
-    transactionDate: new Date().toISOString().split('T')[0],
+    // Initialize with current local time for datetime-local input
+    transactionDate: initialData?.transactionDate
+      ? (initialData.transactionDate.includes('T') ? initialData.transactionDate.substring(0, 16) : initialData.transactionDate)
+      : (() => {
+        const now = new Date();
+        const pad = (n: number) => n.toString().padStart(2, '0');
+        return `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}T${pad(now.getHours())}:${pad(now.getMinutes())}`;
+      })(),
     note: '',
     tagIds: [],
     ...initialData,
@@ -195,7 +202,28 @@ export const TransactionForm: React.FC<TransactionFormProps> = ({
     if (!formData.categoryId) return;
     if (!formData.accountId) return;
 
-    onSubmit(formData);
+    // Convert local datetime-local string to proper ISO string for backend
+    // datetime-local value format: YYYY-MM-DDTHH:mm
+    // new Date(val).toISOString() will give UTC time which backend accepts
+    let submitDate = formData.transactionDate;
+    try {
+      const dateObj = new Date(formData.transactionDate);
+      if (!isNaN(dateObj.getTime())) {
+        submitDate = dateObj.toISOString();
+      } else {
+        // Fallback for date-only strings if any legacy data
+        submitDate = new Date(formData.transactionDate + 'T00:00:00').toISOString();
+      }
+    } catch (e) {
+      console.warn('Date conversion error', e);
+    }
+
+    const payload = {
+      ...formData,
+      transactionDate: submitDate
+    };
+
+    onSubmit(payload);
   }, [formData, onSubmit]);
 
   const handleKeyDown = useCallback(
@@ -213,6 +241,11 @@ export const TransactionForm: React.FC<TransactionFormProps> = ({
   );
 
   // Helpers
+  const toLocalISOString = (date: Date) => {
+    const pad = (n: number) => n.toString().padStart(2, '0');
+    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}T${pad(date.getHours())}:${pad(date.getMinutes())}`;
+  };
+
   const selectedAccount = accounts.find((a) => a.id === formData.accountId);
   const selectedCategory = categories.find((c) => c.id === formData.categoryId);
 
@@ -372,10 +405,10 @@ export const TransactionForm: React.FC<TransactionFormProps> = ({
       </div>
       <div className="transaction-form__field">
         <label className="transaction-form__label" htmlFor="transactionDate">
-          日期
+          日期和时间
         </label>
         <input
-          type="date"
+          type="datetime-local"
           id="transactionDate"
           className="transaction-form__input"
           value={formData.transactionDate}