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datetime@sonichy/README.md

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+# Datetime_GNOME
+Display date and time on GNOME taskbar.  
+![alt](preview.png)
+
+## Changelog
+### V1.0 (2025-04-22)
+
+## Reference
+[guide](https://gjs.guide/extensions/development/creating.html)
+[Cinnamon_Applet](https://github.com/sonichy/Cinnamon_Applet)
+
+## Debug
+dbus-run-session -- gnome-shell --nested --wayland

datetime@sonichy/extension.js

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+import GLib from "gi://GLib";
+import St from 'gi://St';
+
+import {Extension} from 'resource:///org/gnome/shell/extensions/extension.js';
+import * as Main from 'resource:///org/gnome/shell/ui/main.js';
+import * as PanelMenu from 'resource:///org/gnome/shell/ui/panelMenu.js';
+import * as PopupMenu from 'resource:///org/gnome/shell/ui/popupMenu.js';
+
+export default class DatetimeExtension extends Extension {
+    enable() {
+        // Create a panel button
+        this._indicator = new PanelMenu.Button(0.0, this.metadata.name, false);
+        
+        var label = new St.Label({ text: '00:00\n1/1 一' });
+        label.set_style('text-align:center');        
+        this._indicator.add_child(label);        
+
+        // Add the indicator to the panel
+        Main.panel.addToStatusArea(this.uuid, this._indicator);
+        
+        const menuItem = new PopupMenu.PopupMenuItem('');
+        this._indicator.menu.addMenuItem(menuItem);
+        
+        this._timeout = GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 1, () => {
+            var date = new Date();
+	        var h = date.getHours();
+	        if (h < 10)
+	            h = "0" + h;
+	        var m = date.getMinutes();
+	        if (m < 10)
+	            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"];
+            const text = h + ' : ' + m + '\n' + (date.getMonth() + 1) + '/' + date.getDate() + ' ' + weekday[day];            
+            label.set_text(text);
+            menuItem.label.text = date.toLocaleString() + ' ' + weekday1[day];
+            // Run as loop, not once.
+            return GLib.SOURCE_CONTINUE;
+        });
+        
+    }
+
+    disable() {
+        if (this._timeout) {
+            GLib.source_remove(this._timeout);
+            this._timeout = null;
+        }
+        this._indicator?.destroy();
+        this._indicator = null;        
+    }
+    
+}

datetime@sonichy/metadata.json

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+{
+    "uuid": "datetime@sonichy",
+    "name": "datetime",
+    "description": "Display date and time on GNOME taskbar",
+    "author": "sonichy",
+    "version": "1.0",
+    "shell-version": [ "45", "46", "47", "48" ],
+    "url": "https://github.com/sonichy/Cinnamon_Applet"
+}