I am very new to JavaScript and it took me some time to come up with the following function in order to get current date and subtract a year from it:

function getDate() {
    var now = new Date();
    // get current timezone specific date/time
    // timezoneoffset value converts returned offset value to milliseconds
    // get current date value - 1 year
    var dateMinusOneYear = new Date(now.getTime() - 31556952000) + (now.getTimezoneOffset() * 60000);
    var dateStr =
        ("0000" + (dateMinusOneYear.getFullYear())).slice(-4) + "-" +
        ("00" + (dateMinusOneYear.getMonth() + 1)).slice(-2) + "-" +
        ("00" + dateMinusOneYear.getDate()).slice(-2);
    return (dateStr);
}

When I invoke the function, I get the following error: TypeError: dateMinusOneYear.getFullYear is not a function

Can anyone please advise? Some might advise to not use the new Date method at all due to problematic reasons, but I have to use it specifically for some unrelated reasons.