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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>