在两个日期内生成随机日期数组的优雅方法

Question

我有一个显示两个月的日期选择器，我想在每个可见月份中随机选择 3 个日期

  $('.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
  });

这是我的计算

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
}

原文由 mplungjan 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

也许我错过了什么，但这不是吗？

 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);

原文由 Tomasz Nurkiewicz 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 2

console.log(
  new Date(new Date() - Math.random()*(1e+12))
)

原文由 Demven Weir 发布，翻译遵循 CC BY-SA 4.0 许可协议