<script src='https://methodfish.com/Download/MFCalendarPopup/files/latest/js/mf-calendar-popup.js'></script>
<link rel='stylesheet preload prefetch' as='style' href='https://methodfish.com/Download/MFCalendarPopup/files/latest/css/mf-calendar-popup.css'>

// usage: new MFCalendarPopup().getDate(caller-elem, default-date, callback-function)
var _popup = new MFCalendarPopup();
_popup.getDate(e.target, new Date(), setDate);


function closePopup() {
   _popup.removePopup();
}

function setDate(dt) {
   alert('Date set to '+dt);
}