Fixed time zone bug

Fixed bug that was falsely alerting data was old when the data was current. This had to do with accounting for different user time zones.

js/checkdiff.js

@@ -4,15 +4,24 @@
  */
 
 function checkDiff(datestr) {
-    var date = new Date();
+    var newdate = new Date();
     var refreshed = new Date(datestr);
+    var dtz = date.geTtimezoneOffset()/60;
+    var sdtz = refreshed.getTimezoneOffset()/60;
+
+    if (dtz == sdtz ) {
+    	var date = newdate;
+    } else {
+	var date = new Date(newdate.getTime() + sdtz);
+    }
+
     var diff = 30 * 60 * 1000; /* 30 min diff is OK without a warning*/
     var text = document.createElement('div');
+
     // Fixme: Add "icon"
     if (date - refreshed > diff) {
         text.innerHTML = "<i class='fa fa-exclamation-triangle m-orange'></i><b> Old Weather Data </b>";
-//  } else {
-//    text.innerHTML = "<i class=''></i> Fresh Weather";
     }
+
     document.getElementById('freshweather').appendChild(text);
 }