动态生成具有特定格式的日期

Question

我有一个计时器。我必须设定一个要数到的日期。从当前时间到该日期进行计数，并在到达该日期时停止。我该如何使用JavaScript动态生成一个日期：Apr 4, 2020 18:20:25。首先，我必须获取当前日期。我得到new Date().getTime()的信息，然后说我希望计时器在60分钟后结束，因此通过添加new Date().getTime()和60来设置结束日期。但是我不知道该怎么做？有人可以帮我弄这个吗？谢谢：）

    // Set the date we're counting down to
    var countDownDate = new Date("Apr 4, 2020 20:20:25").getTime();

    // Update the count down every 1 second
    var x = setInterval(function() {

    // Get today's date and time
    var now = new Date().getTime();

    // Find the distance between now and the count down date
    var distance = countDownDate - now;

    // Time calculations for minutes and seconds
    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
    var seconds = Math.floor((distance % (1000 * 60)) / 1000);

    // Display the result in the element with id="timer"
    document.getElementById("timer").innerHTML = minutes + "m " + seconds + "s ";

    // If the count down is finished, write some text
    if (distance < 0) {
        clearInterval(x);
        document.getElementById("demo").innerHTML = "EXPIRED";
    }
    }, 1000);

<h1 id="timer"></h1>

Answer 1

无需使用getTime()

// Set the date we're counting down to
var countDownDate = new Date("Apr 4, 2020 20:20:25");

// Update the count down every 1 second
var countdownInterval = setInterval(function() {

  // Get today's date and time
  var now = new Date();

  // Find the distance between now and the count down date
  var distance = countDownDate - now;

  // Time calculations for minutes and seconds
  var minutes = Math.floor(distance / 60000);
  var seconds = Math.floor((distance - (minutes * 60000)) / 1000);

  // Display the result in the element with id="timer"
  document.getElementById("timer").innerHTML = minutes + "m " + seconds + "s ";

  // If the count down is finished, write some text
  if (distance < 0) {
    clearInterval(countdownInterval);
    document.getElementById("timer").innerHTML = "EXPIRED";
  }
}, 1000);

<h1 id="timer"></h1>