使用 'DD/MM/YYYY HH:MM:SS' 获取日期和格式之间的差异

Question

如何将date.now() 中的毫秒转换为DD/MM/YYYY HH:MM:SS 格式或将带有日期的字符串转换为毫秒。

我还有一个返回以下内容的字符串：

appointment: "21/11/2019 18:00:30"

我需要得到 date.now 和 appointment 日期之间的时间差

Answer 1

您需要将日期字符串转换为像"2019-11-21T18:00:30"; 这样的有效格式，然后使用.getTime() 获取差异

试试这样：

let difference = Math.abs(new Date().getTime() - new Date(this.appointment).getTime());

var seconds = difference / 1000;
var minutes = difference / 1000 / 60;
var hours = minutes / 60;

console.log("Difference in Hours",hours)
console.log("Difference in minutes",minutes)
console.log("Difference in seconds",seconds)

Working Demo

Answer 2

这里是working Example

var d = new Date,
dformat = [d.getDate(),
          d.getMonth()+1 ,
           d.getFullYear()].join('/')+' '+
          [d.getHours(),
           d.getMinutes(),
           d.getSeconds()].join(':');
           console.log(dformat)

输出

26/12/2019 15:48:17

Answer 3

要转换日期，您可以使用 DatePipe：

let datePipe = new DatePipe();
datePipe.transform(date, 'dd/MM/yyyy hh:mm:ss');

要了解 Date.now() 和日期之间的区别，您可以查看此 answer，或者您可以像这样使用 moment：

import * as moment from 'moment';

// ...

const difference = moment(moment(),"DD/MM/YYYY HH:mm:ss").diff(moment(appointment,"DD/MM/YYYY HH:mm:ss"))

你需要像这样安装moment：

npm install --save moment

Answer 4

小时差：

const dateAppointment = new Date('1/11/2019 18:00:30');
const currentDate = new Date();
console.log(`currentDate is `, currentDate );
const diffTime = Math.abs(currentDate - dateAppointment);
const diffHours = Math.ceil(diffTime / (1000 * 60 * 60)); 
console.log(`diffHours is`, diffHours );

一个例子：

const dateAppointment = new Date('1/11/2019 18:00:30');
const currentDate = new Date();
console.log(`currentDate is `, currentDate );
const diffTime = Math.abs(currentDate - dateAppointment);
const diffHours = Math.ceil(diffTime / (1000 * 60 * 60)); 
console.log(`diffHours is`, diffHours );

更新：

HTML：

<p>currentDate is {{ currentDate | date : 'dd.MM.y, HH:mm:ss' }} </p>
<p>dateAppointment is {{ dateAppointment | date : 'dd.MM.y, HH:mm:ss' }} </p>
<p>differenceHour is {{ differenceHour }} </p>

打字稿：

 name = 'Angular';
 currentDate = new Date();
 dateAppointment = new Date('1/11/2019 18:00:30');
 differenceHour = 0;

 constructor(){    
     const diffTime = Math.abs(this.currentDate - this.dateAppointment);
     this.differenceHour = Math.ceil(diffTime / (1000 * 60 * 60)); 
 }

An stackblitz example can be seen here

Answer 5

有一种方法可以在没有第三方的情况下做到这一点

let date = new Date(Date.now());
date = `${date.getDate()}:${date.getMonth() + 1}:${date.getFullYear()}:${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`;

如果你使用 Angular，还有一种使用 Angular 的方法，你可以使用带有变换方法的“DatePipe”，就像这样：

datePipe.transform(date, 'dd/MMM/yyyy hh:mm:ss');

要获得不同的日期，只有一种方法

const currentDate = new Date('26/12/2019');
const appoinemnt = new Date('15/1/2020');
const diffTime = Math.abs(appoinemnt - currentDate );
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24)); 
console.log(diffDays);