Check if date object is over one year old

Question

I would like to see if a date object is over one year old! I don't know how to even compare them due to the leap years etc..

var oldDate = new Date("July 21, 2001 01:15:23");
var todayDate = new Date();

if(???) {
    console.log("it has been over one year!");
} else {
    console.log("it has not gone one year yet!");
}

Answer 1

You could make the check like this

(todayDate - oldDate) / (1000 * 3600 * 24 * 365) > 1

You can see and try it here:

https://jsfiddle.net/rnyxzLc2/

Answer 2

This code should handle leap years correctly.

Essentially:

If the difference between the dates' getFullYear() is more than one,
or the difference equals one and todayDate is greater than oldDate after setting their years to be the same,
then there's more than a one-year difference.

var oldDate = new Date("Oct 2, 2014 01:15:23"),
    todayDate = new Date(),
    y1= oldDate.getFullYear(),
    y2= todayDate.getFullYear(),
    d1= new Date(oldDate).setFullYear(2000),
    d2= new Date(todayDate).setFullYear(2000);

console.log(y2 - y1 > 1 || (y2 - y1 == 1 && d2 > d1));