diff --git a/packages/frontend-misskey-world-engine/src/envs/lobby.ts b/packages/frontend-misskey-world-engine/src/envs/lobby.ts
index 724ea74e52..62ae5ab4e7 100644
--- a/packages/frontend-misskey-world-engine/src/envs/lobby.ts
+++ b/packages/frontend-misskey-world-engine/src/envs/lobby.ts
@@ -11,6 +11,7 @@ import { findMaterial, GRAPHICS_QUALITY, Timer } from '../utility.js';
 import { WorldEnvManager } from '../env.js';
 import { RecyvlingTextGrid, createPlaneUvMapper, randomRange } from '../utility.js';
 import { Firework } from '../Firework.js';
+import { getTimezoneOffsetLabel, timezones } from '../timezones.js';
 import type { WorldEngine } from '../engine.js';
 
 export class LobbyEnvManager extends WorldEnvManager {
@@ -25,6 +26,7 @@ export class LobbyEnvManager extends WorldEnvManager {
 	private textBwMaterial: BABYLON.StandardMaterial | null = null;
 	private translucentTextMaterial: BABYLON.StandardMaterial | null = null;
 	private timer: Timer = new Timer();
+	private tz = timezones.find((tz) => tz.abbrev === 'JST')!;
 
 	constructor(engine: WorldEngine) {
 		super(engine);
@@ -228,11 +230,11 @@ export class LobbyEnvManager extends WorldEnvManager {
 			});
 
 			this.timer.setInterval(() => {
-				const now = new Date();
+				const now = this.getCurrentTime();
 				const hours = now.getHours().toString().padStart(2, '0');
 				const minutes = now.getMinutes().toString().padStart(2, '0');
 				const seconds = now.getSeconds().toString().padStart(2, '0');
-				text.write(`${hours}:${minutes}:${seconds}`);
+				text.write(`${hours}:${minutes}:${seconds} ${getTimezoneOffsetLabel(this.tz.offset)}`);
 			}, 1000);
 		}
 
@@ -262,11 +264,13 @@ export class LobbyEnvManager extends WorldEnvManager {
 			});
 
 			this.timer.setInterval(() => {
-				const now = new Date();
+				const now = this.getCurrentTime();
 				const years = now.getFullYear().toString();
 				const months = (now.getMonth() + 1).toString().padStart(2, '0');
 				const days = now.getDate().toString().padStart(2, '0');
-				text.write(`${years}/${months}/${days}`);
+				const dayOfWeek = now.getDay();
+				const dayOfWeekStr = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][dayOfWeek];
+				text.write(`${this.tz.abbrev} ${years}/${months}/${days} ${dayOfWeekStr.toUpperCase()}`);
 			}, 1000);
 		}
 
@@ -436,7 +440,7 @@ export class LobbyEnvManager extends WorldEnvManager {
 		const minuteHands = this.meshes.filter(m => m.name.includes('__CLOCK_HAND_M__'));
 
 		this.timer.setInterval(() => {
-			const now = new Date();
+			const now = this.getCurrentTime();
 			const hours = now.getHours() % 12;
 			const minutes = now.getMinutes();
 			const hAngle = -(hours / 12) * Math.PI * 2 - (minutes / 60) * (Math.PI * 2 / 12);
@@ -500,6 +504,12 @@ export class LobbyEnvManager extends WorldEnvManager {
 		}
 	}
 
+	private getCurrentTime() {
+		const now = new Date();
+		now.setMinutes(now.getMinutes() + now.getTimezoneOffset() + this.tz.offset);
+		return now;
+	}
+
 	public dispose() {
 		this.timer.dispose();
 		for (const m of this.meshes) {
diff --git a/packages/frontend-misskey-world-engine/src/timezones.ts b/packages/frontend-misskey-world-engine/src/timezones.ts
new file mode 100644
index 0000000000..06113af1c6
--- /dev/null
+++ b/packages/frontend-misskey-world-engine/src/timezones.ts
@@ -0,0 +1,74 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const timezones = [{
+	name: 'UTC',
+	abbrev: 'UTC',
+	offset: 0,
+}, {
+	name: 'Europe/Berlin',
+	abbrev: 'CET',
+	offset: 60,
+}, {
+	name: 'Asia/Tokyo',
+	abbrev: 'JST',
+	offset: 540,
+}, {
+	name: 'Asia/Seoul',
+	abbrev: 'KST',
+	offset: 540,
+}, {
+	name: 'Asia/Shanghai',
+	abbrev: 'CST',
+	offset: 480,
+}, {
+	name: 'Australia/Sydney',
+	abbrev: 'AEST',
+	offset: 600,
+}, {
+	name: 'Australia/Darwin',
+	abbrev: 'ACST',
+	offset: 570,
+}, {
+	name: 'Australia/Perth',
+	abbrev: 'AWST',
+	offset: 480,
+}, {
+	name: 'America/New_York',
+	abbrev: 'EST',
+	offset: -300,
+}, {
+	name: 'America/Mexico_City',
+	abbrev: 'CST',
+	offset: -360,
+}, {
+	name: 'America/Phoenix',
+	abbrev: 'MST',
+	offset: -420,
+}, {
+	name: 'America/Los_Angeles',
+	abbrev: 'PST',
+	offset: -480,
+}];
+
+export function getTimezoneAbbrev(timezone: string | null): string {
+	if (timezone === null) {
+		return timezones.find((tz) => tz.name.toLowerCase() === Intl.DateTimeFormat().resolvedOptions().timeZone.toLowerCase())?.abbrev ?? '?';
+	} else {
+		return timezones.find((tz) => tz.name.toLowerCase() === timezone.toLowerCase())?.abbrev ?? '?';
+	}
+}
+
+export function getTimezoneOffset(timezone: string | null): number {
+	if (timezone === null) {
+		return 0 - new Date().getTimezoneOffset();
+	} else {
+		return timezones.find((tz) => tz.name.toLowerCase() === timezone.toLowerCase())?.offset ?? 0;
+	}
+}
+
+export function getTimezoneOffsetLabel(tzOffset: number): string {
+	return (tzOffset >= 0 ? '+' : '-') + Math.floor(tzOffset / 60).toString().padStart(2, '0') + ':' + (tzOffset % 60).toString().padStart(2, '0');
+}
diff --git a/packages/frontend/assets/world/envs/lobby/lobby.blend b/packages/frontend/assets/world/envs/lobby/lobby.blend
index ae21726b77..201f8ca6f4 100644
Binary files a/packages/frontend/assets/world/envs/lobby/lobby.blend and b/packages/frontend/assets/world/envs/lobby/lobby.blend differ
diff --git a/packages/frontend/assets/world/envs/lobby/lobby.glb b/packages/frontend/assets/world/envs/lobby/lobby.glb
index ea9d3e3bcd..6c32d4557e 100644
Binary files a/packages/frontend/assets/world/envs/lobby/lobby.glb and b/packages/frontend/assets/world/envs/lobby/lobby.glb differ