带有自定义日期的Javascript日期倒计时

// 设置目标日期和时间
var targetDate = new Date("2022-12-31T23:59:59");

// 更新倒计时
function updateCountdown() {
  var currentDate = new Date();
  var timeDifference = targetDate.getTime() - currentDate.getTime();

  // 计算剩余的天数、小时、分钟和秒数
  var days = Math.floor(timeDifference / (1000 * 60 * 60 * 24));
  var hours = Math.floor((timeDifference % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((timeDifference % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((timeDifference % (1000 * 60)) / 1000);

  // 更新倒计时显示
  document.getElementById("countdown").innerHTML = days + "天 " + hours + "小时 " + minutes + "分钟 " + seconds + "秒";

  // 每秒更新一次倒计时
  setTimeout(updateCountdown, 1000);
}

// 启动倒计时
updateCountdown();