JSFiddle - React, Tailwind, and code Playground

HTML

<input id="date"/>

JavaScript

$("#date").datepicker({
    numberOfMonths: 2,
    onSelect: function( selectedDate ) {
        if(!$(this).data().datepicker.first){
            $(this).data().datepicker.inline = true
            $(this).data().datepicker.first = selectedDate;
        }else{
            if(selectedDate > $(this).data().datepicker.first){
                $(this).val($(this).data().datepicker.first+" - "+selectedDate);
            }else{
                $(this).val(selectedDate+" - "+$(this).data().datepicker.first);
            }
            $(this).data().datepicker.inline = false;
        }
    },
    onClose:function(){
        delete $(this).data().datepicker.first;
        $(this).data().datepicker.inline = false;
    }
})