Eclipse has plugins that can create and handle this kind of patch:
Code:
diff --git app/drupal/sites/all/modules/contrib/date/date/date.module app/drupal/sites/all/modules/contrib/date/date/date.module
index f2de838..9475cac 100644
--- app/drupal/sites/all/modules/contrib/date/date/date.module
+++ app/drupal/sites/all/modules/contrib/date/date/date.module
@@ -474,6 +474,7 @@ function date_field(, &, , &, , ) {
return _date_field_validate(, , , , , );
break;
+ case 'presave':
case 'insert':
case 'update':
require_once('./'. drupal_get_path('module', 'date') .'/date_elements.inc');