node.module patch to fix date check

node.module.patch

--- node.module	2011-08-09 10:36:01.000000000 -0300
+++ node.module	2011-08-09 12:25:13.000000000 -0300
@@ -803,9 +803,10 @@
       // are dealing with an anonymous user we set the user ID to 0.
       form_set_error('name', t('The username %name does not exist.', array('%name' => $node->name)));
     }
-
+    $strtotime = strtotime($node->date);
     // Validate the "authored on" field. As of PHP 5.1.0, strtotime returns FALSE instead of -1 upon failure.
-    if (!empty($node->date) && strtotime($node->date) <= 0) {
+    // 0 is a perfectly valid date, so check for false and -1 instead of <= 0
+    if (!empty($node->date) && ($strtotime === false || $strtotime === -1) ) {
       form_set_error('date', t('You have to specify a valid date.'));
     }
   }