How to req a date in node from angular 2/4?

I'm trying to request a date in node from angular. What do i put in post router to req the date?

This is my angular code for a customer object

customers: Customer[];
customer: Customer;
firstName: string;
lastName: string;
today: number= Date.now();

addCustomer(){
   const newCustomer = {
   firstName: this.firstName,
   lastName: this.lastName,
   today: this.today

}

My router to post the customer in the database looks like this

router.post('/customers', (req,res,next) =>{

let newCustomer = new Customer({

    firstName: req.body.firstName,
    lastName: req.body.lastName,

});

newCustomer.save(function(err, Customer){

    if (err){
        res.json({msg: 'Failed to add contact'});
    }else{
        res.json({msg: 'Customer added to waitlist'});  
    }
}); 

});

via TexasState Han