better datetime tooltip

datetime@sonichy/README.md

@@ -12,6 +12,13 @@ Display date and time on GNOME taskbar.
 [Guide](https://gjs.guide/extensions/development/creating.html)  
 [Cinnamon_Applet](https://github.com/sonichy/Cinnamon_Applet)  
 [Calendar](https://gitlab.gnome.org/GNOME/gnome-shell/-/blob/main/js/ui/dateMenu.js#L901)  
+[Tooltip](https://gitlab.com/arcmenu/ArcMenu)  
+[Dialog](https://gjs.guide/extensions/topics/dialogs.html)  
+[Settings](https://gjs.guide/extensions/development/preferences.html)
+[Settings](https://gjs.guide/guides/gtk/3/16-settings.html#title:-application-settings)
+
+## GSettings schema must be compiled
+`glib-compile-schemas schemas/`
 
 ## Debug
 dbus-run-session -- gnome-shell --nested --wayland  

datetime@sonichy/extension.js

@@ -94,16 +94,19 @@ export default class DatetimeExtension extends Extension {
             var date = new Date();
 	        var h = date.getHours();
 	        if (h < 10)
-	            h = "0" + h;
+	            h = '0' + h;
 	        var m = date.getMinutes();
 	        if (m < 10)
-	            m = "0" + m;
+	            m = '0' + m;
 	        var day = date.getDay();
-	        var weekday = ["日", "一", "二", "三", "四", "五", "六"];
-	        var weekday1 = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
+	        var weekday = ['日', '一', '二', '三', '四', '五', '六'];
+	        var weekday1 = ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'];
             var text = h + ':' + m + '\n' + (date.getMonth() + 1) + '/' + date.getDate() + ' ' + weekday[day];            
             label.set_text(text);            
             var s = this._settings.get_string('memo');
+            if (s == '')
+                this.label_tooltip.text = date.toLocaleString() + ' ' + weekday1[day];
+            else
                 this.label_tooltip.text = date.toLocaleString() + ' ' + weekday1[day] + '\n' + s;
             // Run as loop, not once.
             return GLib.SOURCE_CONTINUE;