Elegant method to generate array of random dates within two dates

Question

I have a datepicker where I show two months and I want to randomly choose 3 dates in each visible month

  $('.date').datepicker({     minDate: new Date(),     dateFormat: 'DD, MM, d, yy',     constrainInput: true,     beforeShowDay: processDates,     numberOfMonths: 2,     showButtonPanel: true,     showOn: "button",     buttonImage: "images/calendar_icon.jpg",     buttonImageOnly: true       }); 

Here is my calculation

var now = new Date(); var nowTime = parseInt(now.getTime()/1000); var randomDateSet = {};  function getRandomSet(y,m) {   var monthIndex = "m"+y+""+m; // m20121 for Jan   if (randomDateSet[monthIndex]) return randomDateSet[monthIndex];   // generate here . . - I need this part .   return randomDateSet[monthIndex]; }  function processDay(date) { // this is calculated for each day so we need a singleton for the array   var dateTime = parseInt(date.getTime()/1000);   if (dateTime <= (nowTime-86400)) {     return [false]; // earlier than today   }   var m = date.getMonth(), d = date.getDate(), y = date.getFullYear();   var randomDates = getRandomSet(y,m);    for (i = 0; i < randomDates.length; i++) {     if($.inArray((m+1) + '-' + d + '-' + y,randomDates) != -1 || new Date() > date) {       return [true,"highlight","Some message"];     }   }   return [true,"normal"]; // ordinary day } 

Answer 1

Maybe I am missing something, but isn't this it?

function randomDate(start, end) {   return new Date(start.getTime() + Math.random() * (end.getTime() - start.getTime())); }  const d = randomDate(new Date(2012, 0, 1), new Date()); console.log(d);