Generate random date but exclude some dates from array in javascript

Question

I have an array called dates which contains some dates. I want to exclude those dates and generate a new random date which starts from today.

dates = [20/2/2020,10/2/2019] //dates needs to be excluded

So far I have tried,

        var new_dif =  Math.random(); //generates random number
        
        var daea = new Date(new_dif); //new random date
        
        alert(daea); //generates new date with year 1970

Answer 1

1. Create random date from today
2. Have while loop, Check generated already exist in exclude dates array (continue loop until you find date which is not in dates array)

const randomDateFromToday = (exclude_dates, max_days = 365) => {
  const randomDate = () => {
    const rand = Math.floor(Math.random() * max_days) * 1000 * 60 * 60 * 24;
    const dat = new Date(Date.now() + rand);
    return `${dat.getDate()}/${dat.getMonth() + 1}/${dat.getFullYear()}`;
  };
  let rday = randomDate();
  while (exclude_dates.some((date_str) => date_str === rday)) {
    rday = randomDate();

  }
  return rday;
};

dates = ["20/2/2020", "10/2/2019"];
console.log(randomDateFromToday(dates));
console.log(randomDateFromToday(dates));