How to return only the Date from a SQL Server DateTime datatype.

I am getting this error Uncaught ReferenceError: cmd is not defined at HTMLButtonElement.onclick whenever clicked on button

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I am getting this error Uncaught ReferenceError: cmd is not defined at HTMLButtonElement.onclick whenever clicked on button

<!DOCTYPE html>
<html>

<head>
  <title>my location</title>
</head>

<body>
  <h1>location</h1>
  <button onclick="cmd()">Get location</button>
  <div id="output"></div>


  <script>
    var x = document.getElementById('output');

    function cmd() {
      if (navigator.Geolocation) {
        alert("supports location")
      } else {
        alert("doesn't support")
      }
    }
  </script>
</body>

</html>