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