fix(core): Use the configured timezone in task runner (#12032)

docker/images/n8n/n8n-task-runners.json

@@ -7,6 +7,7 @@
 			"args": ["/usr/local/lib/node_modules/n8n/node_modules/@n8n/task-runner/dist/start.js"],
 			"allowed-env": [
 				"PATH",
+				"GENERIC_TIMEZONE",
 				"N8N_RUNNERS_GRANT_TOKEN",
 				"N8N_RUNNERS_N8N_URI",
 				"N8N_RUNNERS_MAX_PAYLOAD",

packages/@n8n/task-runner/src/config/base-runner-config.ts

@@ -34,6 +34,9 @@ export class BaseRunnerConfig {
 	@Env('N8N_RUNNERS_AUTO_SHUTDOWN_TIMEOUT')
 	idleTimeout: number = 0;
 
+	@Env('GENERIC_TIMEZONE')
+	timezone: string = 'America/New_York';
+
 	@Nested
 	healthcheckServer!: HealthcheckServerConfig;
 }

packages/@n8n/task-runner/src/js-task-runner/__tests__/js-task-runner.test.ts

@@ -1,5 +1,5 @@
 import { DateTime } from 'luxon';
-import type { CodeExecutionMode, IDataObject } from 'n8n-workflow';
+import { setGlobalState, type CodeExecutionMode, type IDataObject } from 'n8n-workflow';
 import fs from 'node:fs';
 import { builtinModules } from 'node:module';
 
@@ -326,6 +326,43 @@ describe('JsTaskRunner', () => {
 			});
 		});
 
+		describe('timezone', () => {
+			it('should use the specified timezone in the workflow', async () => {
+				const taskData = newDataRequestResponse(inputItems.map(wrapIntoJson), {});
+				taskData.workflow.settings = {
+					timezone: 'Europe/Helsinki',
+				};
+
+				const outcome = await execTaskWithParams({
+					task: newTaskWithSettings({
+						code: 'return { val: $now.toSeconds() }',
+						nodeMode: 'runOnceForAllItems',
+					}),
+					taskData,
+				});
+
+				const helsinkiTimeNow = DateTime.now().setZone('Europe/Helsinki').toSeconds();
+				expect(outcome.result[0].json.val).toBeCloseTo(helsinkiTimeNow, 1);
+			});
+
+			it('should use the default timezone', async () => {
+				setGlobalState({
+					defaultTimezone: 'Europe/Helsinki',
+				});
+
+				const outcome = await execTaskWithParams({
+					task: newTaskWithSettings({
+						code: 'return { val: $now.toSeconds() }',
+						nodeMode: 'runOnceForAllItems',
+					}),
+					taskData: newDataRequestResponse(inputItems.map(wrapIntoJson), {}),
+				});
+
+				const helsinkiTimeNow = DateTime.now().setZone('Europe/Helsinki').toSeconds();
+				expect(outcome.result[0].json.val).toBeCloseTo(helsinkiTimeNow, 1);
+			});
+		});
+
 		it('should allow access to Node.js Buffers', async () => {
 			const outcomeAll = await execTaskWithParams({
 				task: newTaskWithSettings({

packages/@n8n/task-runner/src/start.ts

@@ -1,4 +1,4 @@
-import { ensureError } from 'n8n-workflow';
+import { ensureError, setGlobalState } from 'n8n-workflow';
 import Container from 'typedi';
 
 import { MainConfig } from './config/main-config';
@@ -44,6 +44,10 @@ function createSignalHandler(signal: string) {
 void (async function start() {
 	const config = Container.get(MainConfig);
 
+	setGlobalState({
+		defaultTimezone: config.baseRunnerConfig.timezone,
+	});
+
 	if (config.sentryConfig.sentryDsn) {
 		const { ErrorReporter } = await import('@/error-reporter');
 		errorReporter = new ErrorReporter(config.sentryConfig);

packages/cli/src/runners/__tests__/task-runner-process.test.ts

@@ -76,6 +76,7 @@ describe('TaskRunnerProcess', () => {
 			'N8N_VERSION',
 			'ENVIRONMENT',
 			'DEPLOYMENT_NAME',
+			'GENERIC_TIMEZONE',
 		])('should propagate %s from env as is', async (envVar) => {
 			jest.spyOn(authService, 'createGrantToken').mockResolvedValue('grantToken');
 			process.env[envVar] = 'custom value';

packages/cli/src/runners/task-runner-process.ts

@@ -54,6 +54,7 @@ export class TaskRunnerProcess extends TypedEmitter<TaskRunnerProcessEventMap> {
 
 	private readonly passthroughEnvVars = [
 		'PATH',
+		'GENERIC_TIMEZONE',
 		'NODE_FUNCTION_ALLOW_BUILTIN',
 		'NODE_FUNCTION_ALLOW_EXTERNAL',
 		'N8N_SENTRY_DSN',