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<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Dates</h2>
<p>Calculate the number of years since January 1, 1970.</p>
<p id="demo"></p>
<script>
// Calculate milliseconds in a year
const minute = 1000 * 60;
const hour = minute * 60;
const day = hour * 24;
const year = day * 365;
// Divide Date.now() with a year
let years = Math.round(Date.now() / year);
document.getElementById("demo").innerHTML = years;
</script>
</body>
</html>