unicorn-components/src/pipes/format-date.pipe.ts

<a target="_blank" href="https://getunicorn.io"><img src="https://bitbucket-assetroot.s3.amazonaws.com/c/photos/2017/Jul/07/2615006260-5-nitsnetsstudios-ondemand-UNI_avatar.png" align="left"></a>

import * as moment from 'moment';

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'formatDate' })
export class FormatDatePipe implements PipeTransform {
    transform(value: string, format: string = null, today = false, yesterday = false): string {
        if (!value) { return value; }
        const mo = moment(new Date(value));
        if (!format) { return mo.calendar(); }
        if (today && moment().diff(mo, 'days') === 0) { return 'Today'; }
        if (yesterday && moment().diff(mo, 'days') === 1) { return 'Yesterday'; }
        return mo.format(format);
    }
}