Calendar sample iOS

app.js

const win = Ti.UI.createWindow();

function createEvent() {
	let calendarId;
	for (const calendar of Ti.Calendar.allCalendars) {
		Ti.API.info(calendar.name, calendar.id);
		// This probably is not good enough for an app, the calendar most likely should be selected by the user
		if (calendar.name === 'Calendar') {
			calendarId = calendar.id
		}
	}

	if (!calendarId) {
		console.error('Failed to find calendar id for "Calendar"');
		return;
	}

	const begin = new Date('2021-06-29T12:00:00');
	const end =  new Date('2021-06-29T12:30:00');
	const calendar = Ti.Calendar.getCalendarById(calendarId);

	const sampleEvent = calendar.createEvent({
		title: 'Sample Event',
		notes: 'This is a test event which has some values assigned to it.',
		begin,
		end
	});

	// Now create an alert for the event, then add it to the alerts array
	const sampleAlert = sampleEvent.createAlert({
		absoluteDate:  new Date('2021-06-29T11:00:00')
	});
	sampleEvent.alerts = [ sampleAlert ];

	// Now save the event to persist it to the calendar
	sampleEvent.save();
	console.log(`Created event ${sampleEvent.id}`);
}

win.addEventListener('click', () => {
  if (Ti.Calendar.hasCalendarPermissions()) {
			return createEvent()
	}
	Ti.Calendar.requestCalendarPermissions((e) => {
		if (!e.success) {
			console.error('Permissions not granted');
			return;
		}
		return createEvent();
	});
});

win.open()