如何计算当前日期与创建日期的剩余时间？答案

【问题标题】：How can i calculate the remaining time of the current date with the created date?如何计算当前日期与创建日期的剩余时间？
【发布时间】：2020-10-09 08:03:57
【问题描述】：

我需要计算到未来某个时间点的剩余时间。我正在使用new Date() 获取当前日期，例如：

Fri Oct 09 2020 09:59:21 GMT+0200 (Central European Summer Time)

我怎样才能计算到对象中的这个时间的剩余时间：

{
   appointment_date: "Tue Oct 20 2020"
   appointment_hour: "08:00 - 09:00"
}

我想以月、周、日等为单位显示。如果为零，则应省略。

【问题讨论】：

标签： javascript momentjs

【解决方案1】：

您可以为此使用moment.duration()。

const appointment = {
  appointment_date: "Tue Oct 20 2020",
  appointment_hour: "08:00 - 09:00"
};

const appointmentString = appointment.appointment_date + " " + appointment.appointment_hour.split(' - ')[0];
const difference = moment.duration(
  moment(appointmentString, "ddd MMM DD YYYY HH:mm").diff(moment()));

const result = [];

const units = [
  "months",
  "weeks",
  "days",
  "hours",
  "minutes",
  "seconds"
];

units.forEach(function(unit) {
  // This is equal to difference.months() > 0, difference.weeks() > 0, etc
  if (difference[unit]() > 0) {
    result.push(difference[unit]() + " " + unit);
  }
});

console.log(result.join(', '));

&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"&gt;&lt;/script&gt;

【讨论】：

感谢鲁本的回复

【解决方案2】：

如果你想要纯 JavaScript 的解决方案，试试这个

const appointment = {
  appointment_date: "Tue Oct 20 2020",
  appointment_hour: "08:00 - 09:00"
};

const result = [];
var curr = new Date().getTime();
var appo = new Date(appointment.appointment_date).getTime() + parseInt(appointment.appointment_hour.split(' - ')[0]) *60 *60 *1000;

function dhm(t){
    var cd = 24 * 60 * 60 * 1000,
        ch = 60 * 60 * 1000,
        d = Math.floor(t / cd),
        h = Math.floor( (t - d * cd) / ch),
        m = Math.round( (t - d * cd - h * ch) / 60000);
  if( m === 60 ){
    h++;
    m = 0;
  }
  if( h === 24 ){
    d++;
    h = 0;
  }
  return [d, h, m].join(':');
}
console.log(appo - curr)
console.log( dhm( appo - curr ) );

【讨论】：