Fixes a "strftime() expects parameter 2 to be integer, string given" PHP Warning.

Author: pocketarc

src/FontLib/BinaryStream.php

@@ -275,10 +275,8 @@ public function readLongDateTime() {
     $this->readUInt32(); // ignored
     $date = $this->readUInt32() - 2082844800;
 
-    if ($date > PHP_INT_MAX) {
-      $date = PHP_INT_MAX;
-    } elseif ($date < PHP_INT_MIN) {
-      $date = PHP_INT_MIN;
+    if (is_string($date) || $date > PHP_INT_MAX || $date < PHP_INT_MIN) {
+      $date = 0;
     }
 
     return strftime("%Y-%m-%d %H:%M:%S", $date);