Role: Returns the four-digit number representing the year .
Syntax: dateObject.getFullYear ()
Returns: Year when dateObject expressed in local time returned. The return value is a four-digit number indicating the full year including century, including the value, rather than the double-digit abbreviated form.
Tip: This method is always used in conjunction with a Date object.
var d = new Date()
console.log(d.getFullYear()) // 2019