fix date

sd-card/html/graph.html

@@ -19,7 +19,8 @@ function run() {
 <button onclick="document.getElementById('editor').hidden = false; this.hidden = true;" >Editor</button>
 <div id='editor' hidden='true'>
 <textarea id="cnsl">
-var date = getFullYear() + "-" + (getMonth()+1) + "-" + getDate();    
+const d = new Date();
+var date = d.getFullYear() + "-" + (d.getMonth()+1) + "-" + d.getDate();    
 fetch('/fileserver/log/message/log_'+date+'.txt')
 .then(response => {
     // handle the response