Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to calculate the number of years since midnight, January 1, 1970.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var minutes = 1000 * 60;
    var hours = minutes * 60;
    var days = hours * 24;
    var years = days * 365;
    var d = new Date();
    var t= d.getTime();

    var y = Math.round(t / years);

    document.getElementById("demo").innerHTML = y;
}
</script>

</body>
</html>