JSFiddle - React, Tailwind, and code Playground

HTML

<input id="testInput"  type="datetime-local" value="1985-04-12T23:20:50.52"/>

JavaScript

var lastValue = $('input#testInput').val();


$('input#testInput').on('change', function(event)
{    
    var newValue = $('input#testInput').val();
    if(!newValue || newValue === "")
    {
        $('input#testInput').val(lastValue);
    }
    else
        lastValue = newValue;
});