What's the correct way to use maxAge with Express.js?

I have seen several variations. Suppose I wish my cookie to expire after one second. Should I use

app.use(express.session({ secret: 'mysecret',  maxAge: new Date(Date.now() + 1000)}));

or

app.use(express.session({ secret: 'mysecret',  maxAge: 1000}));

or

app.use(express.session({ secret: 'mysecret',  cookie: {maxAge: new Date(Date.now() + 1000)}}));

or

app.use(express.session({ secret: 'mysecret',  cookie: {maxAge: 1000}}));

Also suppose I have set my cookie expiring correctly and it has expired. If the user does not restart their browser do they still retain the cookie information until they do so?