flatpickr

https://github.com/chmln/flatpickr

examples

<input id="myDateTime">
<input id="myDateOnly" data-date-format="m/d/Y" data-default-date="today" data-min-date="today">
<input id="myTimeOnly" class="flatpickr" data-enable-time="true" data-no-calendar="true" data-date-format="h:i K">


<input id="check_in_date" data-date-format="n/j/y h:i K"> <input id="check_out_date" data-date-format="n/j/y h:i K">
dependencies
  <input id="myDateTime">
  --- script ---
  var dt = new Date();
  document.getElementById("myDateTime").flatpickr({
    dateFormat: 'n/j/y h:i K',
    defaultDate: dt,
    allowInput: true,
    enableTime: true,
    minDate: dt
  });