<html>
<body>
<input type="datetime" id="myDatetime">
<p>Click the button to disable the datetime field.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> input elements with type="datetime" do not show as any datetime field/calendar in any of the major browsers, except Safari.</p>
<script>
function myFunction() {
document.getElementById("myDatetime").disabled = true;
}
</script>
</body>
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</html>