Tryit Editor v2.7

Edit This Code:
<!DOCTYPE html>
<html>
<body>

Date: <input type="datetime-local" id="myLocalDate" step=".1">

<p>Click the button to change the value of the step attribute of the local date field (milliseconds interval).</p>

<p><b>Tip:</b> Try the up and down arrows in the local date field for milliseconds before and after you click the button.</p>

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

<p><strong>Note:</strong> input elements with type="datetime-local" are not supported in Internet Explorer or Firefox.</p>

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

<script>
function myFunction() {
    document.getElementById("myLocalDate").step = ".020";
    document.getElementById("demo").innerHTML = "The value of the step attribute was changed from '.1' to '.050'.";
}
</script>

</body>
</html>