diff --git a/packages/nodes-base/nodes/Google/Calendar/test/node/calendar.availability.test.ts b/packages/nodes-base/nodes/Google/Calendar/test/node/calendar.availability.test.ts
new file mode 100644
index 0000000000..8e75ef2c7a
--- /dev/null
+++ b/packages/nodes-base/nodes/Google/Calendar/test/node/calendar.availability.test.ts
@@ -0,0 +1,74 @@
+import type { MockProxy } from 'jest-mock-extended';
+import { mock } from 'jest-mock-extended';
+import type { INode, IExecuteFunctions } from 'n8n-workflow';
+
+import * as genericFunctions from '../../GenericFunctions';
+import { GoogleCalendar } from '../../GoogleCalendar.node';
+
+let googleApiRequestArgs: any[] = [];
+const CALENDAR_ID = 'myCalendar';
+
+jest.mock('../../GenericFunctions', () => ({
+	getTimezones: jest.fn(),
+	googleApiRequest: jest.fn(async (...args: any[]) => {
+		googleApiRequestArgs = args;
+		return { calendars: { [CALENDAR_ID]: { busy: [] } } };
+	}),
+	googleApiRequestAllItems: jest.fn(),
+	addTimezoneToDate: jest.fn(),
+	addNextOccurrence: jest.fn(),
+	encodeURIComponentOnce: jest.fn(),
+}));
+
+describe('RespondToWebhook Node', () => {
+	let googleCalendar: GoogleCalendar;
+	let mockExecuteFunctions: MockProxy<IExecuteFunctions>;
+
+	beforeEach(() => {
+		googleCalendar = new GoogleCalendar();
+		mockExecuteFunctions = mock<IExecuteFunctions>({
+			getInputData: jest.fn(),
+			getNode: jest.fn(),
+			getNodeParameter: jest.fn(),
+			getTimezone: jest.fn(),
+			helpers: {
+				constructExecutionMetaData: jest.fn().mockReturnValue([]),
+			},
+		});
+	});
+
+	afterEach(() => {
+		googleApiRequestArgs = [];
+		jest.clearAllMocks();
+	});
+
+	describe('Google Calendar > Calendar > Availability', () => {
+		it('should not have invalid timeMin and timeMax date', async () => {
+			//pre loop setup
+			mockExecuteFunctions.getInputData.mockReturnValue([{ json: {} }]);
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce('calendar');
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce('availability');
+			mockExecuteFunctions.getTimezone.mockReturnValueOnce('Europe/Berlin');
+			mockExecuteFunctions.getNode.mockReturnValue(mock<INode>({ typeVersion: 1.1 }));
+			//operation
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(CALENDAR_ID); // calendar
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(''); // timeMin, not set
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(''); // timeMax, not set
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce({}); // options
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(''); // options.timezone, default to timezone
+
+			await googleCalendar.execute.call(mockExecuteFunctions);
+
+			expect(genericFunctions.googleApiRequest).toHaveBeenCalledTimes(1);
+
+			const body = googleApiRequestArgs[2] as {
+				timeMin: string;
+				timeMax: string;
+			};
+
+			expect(body).toBeDefined();
+			expect(body.timeMin).not.toEqual('Invalid Date');
+			expect(body.timeMax).not.toEqual('Invalid Date');
+		});
+	});
+});
diff --git a/packages/nodes-base/nodes/Google/Calendar/test/node/event.create.test.ts b/packages/nodes-base/nodes/Google/Calendar/test/node/event.create.test.ts
new file mode 100644
index 0000000000..4641e75182
--- /dev/null
+++ b/packages/nodes-base/nodes/Google/Calendar/test/node/event.create.test.ts
@@ -0,0 +1,73 @@
+import type { MockProxy } from 'jest-mock-extended';
+import { mock } from 'jest-mock-extended';
+import type { INode, IExecuteFunctions } from 'n8n-workflow';
+
+import * as genericFunctions from '../../GenericFunctions';
+import { GoogleCalendar } from '../../GoogleCalendar.node';
+
+let googleApiRequestArgs: any[] = [];
+
+jest.mock('../../GenericFunctions', () => ({
+	getTimezones: jest.fn(),
+	googleApiRequest: jest.fn(async (...args: any[]) => {
+		googleApiRequestArgs = args;
+		return {};
+	}),
+	googleApiRequestAllItems: jest.fn(),
+	addTimezoneToDate: jest.fn(),
+	addNextOccurrence: jest.fn(),
+	encodeURIComponentOnce: jest.fn(),
+}));
+
+describe('RespondToWebhook Node', () => {
+	let googleCalendar: GoogleCalendar;
+	let mockExecuteFunctions: MockProxy<IExecuteFunctions>;
+
+	beforeEach(() => {
+		googleCalendar = new GoogleCalendar();
+		mockExecuteFunctions = mock<IExecuteFunctions>({
+			getInputData: jest.fn(),
+			getNode: jest.fn(),
+			getNodeParameter: jest.fn(),
+			getTimezone: jest.fn(),
+			helpers: {
+				constructExecutionMetaData: jest.fn().mockReturnValue([]),
+			},
+		});
+	});
+
+	afterEach(() => {
+		googleApiRequestArgs = [];
+		jest.clearAllMocks();
+	});
+
+	describe('Google Calendar > Event > Create', () => {
+		it('should not have invalid start and end date', async () => {
+			//pre loop setup
+			mockExecuteFunctions.getInputData.mockReturnValue([{ json: {} }]);
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce('event');
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce('create');
+			mockExecuteFunctions.getTimezone.mockReturnValueOnce('Europe/Berlin');
+			mockExecuteFunctions.getNode.mockReturnValue(mock<INode>({ typeVersion: 1.1 }));
+			//operation
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce('myCalendar');
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(''); // start, not set
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(''); // end, not set
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce(true); // useDefaultReminders
+			mockExecuteFunctions.getNodeParameter.mockReturnValueOnce({}); // additionalFields
+
+			await googleCalendar.execute.call(mockExecuteFunctions);
+
+			expect(genericFunctions.googleApiRequest).toHaveBeenCalledTimes(1);
+
+			const body = googleApiRequestArgs[2] as {
+				start: { dateTime: string };
+				end: { dateTime: string };
+			};
+
+			expect(body).toBeDefined();
+			expect(body.start.dateTime).not.toEqual('Invalid Date');
+			expect(body.end.dateTime).not.toEqual('Invalid Date');
+		});
+	});
+});