smalot-bootstrap-datetimepicker (jquery)

https://github.com/smalot/bootstrap-datetimepicker

example

dependencies
  <input class="form-control" id="simpliest" type="text" style="max-width:210px;">
  --- script ---
  var dt = new Date();
  $("#simpliest").datetimepicker({
    format: "mm/dd/yyyy HH:ii P",
    startDate: dt,
    showMeridian: true,
    autoclose: true,
    todayBtn: true
  });