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<html><body><h1>JavaScript Dates</h1><h2>Using new Date()</h2><p>86400000 milliseconds from January 01 1970 UTC is:</p><p id="demo"></p><script>const d = new Date(86400000);document.getElementById("demo").innerHTML = d;</script><p>One day (24 hours) is 86,400,000 milliseconds.</p></body></html>