Flatpicker Plugin
See How To Use Flatpickr
HTML Code
<input class="flatpickr flatpickr-input active" type="text" placeholder="Select Date.." data-id="datetime" readonly="readonly">
Javascript Code
{
altInput: true,
altFormat: "F j, Y",
dateFormat: "Y-m-d",
}
For more information please check official site for detailed technical explanation.