how to call a method of a javascript class from another method of the same class [closed]

I’m studing nodejs and ES6 and i tryed to run this code from a module i have writed:

class myDate
{
    myDateTime()
    {
        return Date();
    }
    myDateTimeAction(req, res){
        res.writeHead(200, {'content-Type': 'text/html'});
        res.write(`The date and time are currently: ${this.myDateTime()}`);
        res.end();
    }
}
exports.myDateTimeClass = myDate;

but when i run this code, nodejs prompt: TypeError: this.myDateTime is not a function

What i have to do to make this code run correctly?