date.pipe.ts

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

@Pipe({
  name: 'dateformat',
})
export class DateFormatPipe implements PipeTransform {
  transform(value: string): string {
    const valDate = new Date(value);
    if (this.isToday(valDate)) {
      return `Сегодня`;
    }
    if (this.isYesterday(valDate)) {
      return `Вчера`;
    }
    return `${this.startFromZero(valDate.getDate())}.${this.startFromZero(
      valDate.getMonth() + 1
    )}.${valDate.getFullYear()}`;
  }

  get now(): Date {
    return new Date();
  }

  startFromZero(val: number): string {
    return `${val}`.length > 1 ? `${val}` : `0${val}`;
  }

  isToday(d: Date): boolean {
    return (
      d.getDate() === this.now.getDate() &&
      d.getMonth() === this.now.getMonth() &&
      d.getFullYear() === this.now.getFullYear()
    );
  }

  isYesterday(d: Date): boolean {
    const yesterday = new Date(this.now);
    yesterday.setDate(yesterday.getDate() - 1);
    return (
      d.getDate() === yesterday.getDate() &&
      d.getMonth() === yesterday.getMonth() &&
      d.getFullYear() === yesterday.getFullYear()
    );
  }
}