Angular 2 "time ago" pipe

The following library does equivalent job in English and could be forked to change the language or support different ones:

https://www.npmjs.com/package/time-ago-pipe

npm install time-ago-pipe --save

Then in the @NgModule you want to use it in:

import {TimeAgoPipe} from 'time-ago-pipe'@NgModule({    imports: [... etc ...],    declarations: [AppComponent, ...etc..., TimeAgoPipe],    bootstrap: [AppComponent]})

And in the template:

<span>{{your_date | timeAgo}}</span>

Finally got it working, quite challenging and requires interval tweaking:)

import {Pipe, ChangeDetectorRef} from 'angular2/core';import {Observable} from 'rxjs/Observable';import {AsyncPipe} from 'angular2/common';@Pipe({    name: 'messageTime',    pure: false})export class MessageTimePipe extends AsyncPipe{    value:Date;    timer:Observable<string>;    constructor(ref:ChangeDetectorRef)    {        super(ref);    }    transform(obj:any, args?:any[]):any    {        if (obj instanceof Date)        {            this.value = obj;            if(!this.timer)            {                this.timer = this.getObservable();            }            return super.transform(this.timer, args);        }        return super.transform(obj, args);    }    private getObservable()    {        return Observable.interval(1000).startWith(0).map(()=>        {            var result:string;            // current time            let now = new Date().getTime();            // time since message was sent in seconds            let delta = (now - this.value.getTime()) / 1000;            // format string            if (delta < 10)            {                result = 'jetzt';            }            else if (delta < 60)            { // sent in last minute                result = 'vor ' + Math.floor(delta) + ' Sekunden';            }            else if (delta < 3600)            { // sent in last hour                result = 'vor ' + Math.floor(delta / 60) + ' Minuten';            }            else if (delta < 86400)            { // sent on last day                result = 'vor ' + Math.floor(delta / 3600) + ' Stunden';            }            else            { // sent more than one day ago                result = 'vor ' + Math.floor(delta / 86400) + ' Tagen';            }            return result;        });    };}

The accepted answer can not work with angular 7+.

I followed this answer and customize for Vietnamese.

https://stackoverflow.com/a/61341940/4964569

I share for whom concern.

import {Pipe, PipeTransform} from '@angular/core';    @Pipe({        name: 'dateAgo',        pure: true    })    export class TimePipe implements PipeTransform {            transform(value: any, args?: any): any {            if (value) {                const seconds = Math.floor((+new Date() - +new Date(value)) / 1000);                if (seconds < 29) // less than 30 seconds ago will show as 'Just now'                    return 'vừa mới đăng';                const intervals = {                    'năm': 31536000,                    'tháng': 2592000,                    'tuần': 604800,                    'ngày': 86400,                    'giờ': 3600,                    'phút': 60,                    'giây': 1                };                let counter;                for (const i in intervals) {                    counter = Math.floor(seconds / intervals[i]);                    if (counter > 0){                      return counter + ' ' + i + ' trước'; // singular (1 day ago)                    }                }            }            return value;        }    }