JSFiddle - React, Tailwind, and code Playground

JavaScript

var date1 = 'Apr 10, 2014';
var date2 = 'Apr 14, 2014';

function isWeekend(start,end){
    start = new Date(start);
    if (start.getDay() == 0 || start.getDay() == 6) return true;
    end = new Date(end);
    
    var day_diff = (end - start) / (1000 * 60 * 60 * 24);
    var end_day = start.getDay() + day_diff;    
    if (end_day > 5) return true;

    return false;
}

console.log(isWeekend(date1,date2));