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<!DOCTYPE html> <html> <body> Date: <input type="datetime-local" id="myLocalDate" value="2014-11-16T15:00:33"> <p>Click the button to decrement the value of the datetime field by 1 minute (each time you click).</p> <p><strong>Note:</strong> This is the same as clicking the down arrow on the right side of the datetime field for the "minute" section.</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").stepDown(); } </script> </body> </html>