<head>
   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   <meta name="author" content="Permondes (see permondes.de)">
-  <meta name="date" content="2019-12-17">
+  <meta name="date" content="2019-12-17a">
   
        <title>Permondes Pocket Calculator</title>