diff --git a/rog/services/csv_processor.py b/rog/services/csv_processor.py
index b5f2862..db4f361 100644
--- a/rog/services/csv_processor.py
+++ b/rog/services/csv_processor.py
@@ -6,6 +6,7 @@ from django.contrib.auth.hashers import make_password
 from django.core.exceptions import ValidationError
 from django.db import transaction
 from datetime import datetime, timedelta, timezone
+from django.utils import timezone as django_timezone
 import csv
 
 from ..models import CustomUser, Team, Member, NewCategory, Entry, NewEvent2
@@ -251,34 +252,26 @@ class EntryCSVProcessor:
             entry_date = None
             if 'entry_date' in row and row['entry_date']:
                 try:
-                    # 様々な日付形式に対応
-                    date_formats = [
-                        '%Y/%m/%d %H:%M',
-                        '%Y/%m/%d',
-                        '%Y-%m-%d %H:%M',
-                        '%Y-%m-%d'
-                    ]
+                    date_formats = ['%Y/%m/%d %H:%M', '%Y/%m/%d', '%Y-%m-%d %H:%M', '%Y-%m-%d']
                 
                     for date_format in date_formats:
                         try:
-                            entry_date = datetime.strptime(row['entry_date'], date_format)
+                            naive_date = datetime.strptime(row['entry_date'], date_format)
+                            entry_date = django_timezone.make_aware(naive_date)
                             break
                         except ValueError:
                             continue
                 
                     if entry_date is None:
-                        raise ValueError(f"Could not parse date: {row['entry_date']}")
-                
-                    # タイムゾーン対応
-                    entry_date = timezone.make_aware(entry_date)
+                        entry_date = event.start_datetime
                 except Exception as e:
                     print(f"Date parsing error: {str(e)}")
                     entry_date = event.start_datetime
             else:
                 entry_date = event.start_datetime
 
-            if entry_date is None:
-                raise ValueError("Could not determine entry date")
+                if entry_date is None:
+                    raise ValueError("Could not determine entry date")
 
             print(f'エントリー日付：{entry_date}')