diff --git a/db/migrate/20160328115649_migrate_new_notification_setting.rb b/db/migrate/20160328115649_migrate_new_notification_setting.rb
index 0a110869027a2f95802f41eaaf118ff9e6bc0c81..3c81b2c37bfe558724b4663f3fdbdf585874cc3f 100644
--- a/db/migrate/20160328115649_migrate_new_notification_setting.rb
+++ b/db/migrate/20160328115649_migrate_new_notification_setting.rb
@@ -7,7 +7,7 @@
 #
 class MigrateNewNotificationSetting < ActiveRecord::Migration
   def up
-    timestamp = Time.now
+    timestamp = Time.now.strftime('%F %T')
     execute "INSERT INTO notification_settings ( user_id, source_id, source_type, level, created_at, updated_at ) SELECT user_id, source_id, source_type, notification_level, '#{timestamp}', '#{timestamp}' FROM members WHERE user_id IS NOT NULL"
   end