Adding UTC clock to the receiver panel bottom.

htdocs/css/openwebrx.css

@@ -753,6 +753,16 @@ img.openwebrx-mirror-img
 	border-radius: 3px;
 }
 
+#openwebrx-clock-utc
+{
+	color: #aaa;
+	display: inline-block;
+	font-size: 10pt;
+	float: left;
+	margin-left: 5px;
+	font-family: 'roboto-mono';
+}
+
 #openwebrx-smeter-db
 {
 	color: #aaa;

htdocs/index.html

@@ -268,6 +268,7 @@
                             <div id="openwebrx-smeter">
                                 <div class="openwebrx-smeter-bar"></div>
                             </div>
+                            <div id="openwebrx-clock-utc">00:00 UTC</div>
                             <div id="openwebrx-smeter-db">0 dB</div>
                         </div>
                     </div>

htdocs/openwebrx.js

@@ -1596,6 +1596,10 @@ function openwebrx_init() {
     bookmarks = new BookmarkBar();
     scanner = new Scanner(bookmarks, 1000);
     initSliders();
+
+    // Run clock
+    setInterval(clock_changed, 60000);
+    clock_changed();
 }
 
 function initSliders() {
@@ -1995,3 +1999,11 @@ function nr_changed() {
         }
     }));
 }
+
+function clock_changed() {
+    // Display UTC clock
+    const now = new Date();
+    const hours = ("00" + now.getUTCHours()).slice(-2);
+    const minutes = ("00" + now.getUTCMinutes()).slice(-2);
+    $("#openwebrx-clock-utc").html(`${hours}:${minutes} UTC`);
+}