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<html><body>Birthday: <input type="datetime" id="myDatetime"><p>Click the button to set the datetime field to read-only.</p><p><strong>Tip:</strong> To see the effect, try to type something in the datetime field before and after clicking the button.</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><p id="demo"></p><script>function myFunction() { document.getElementById("myDatetime").readOnly = true;}</script></body></html>