angular - 次の日付が選択されないように日付の検証

Question

次の日付が選択されないように日付検証を書きたい角度の日付ピッカーについて書きたい角度の例：今日は日付17/12/2020です。日付17または16または17以上を選択できますが、日付18または日付を選択することはできません17歳未満。Angularでの書き方を知りたい

html ファイル:

<div class="form-group col-md-6">
  <label for="date">Date</label>
  <input type="date" formControlName="date" class="form-control" id="date" placeholder="date">
</div>

add-ticket.component.ts ファイル

import { FormBuilder, FormControl, FormGroup, Validators } from '@angular/forms';
import { Component, OnInit } from '@angular/core';
import { TicketService } from 'src/app/services/ticket/ticket.service';
import Swal from 'sweetalert2/dist/sweetalert2.js';

@Component({
  selector: 'app-add-ticket',
  templateUrl: './add-ticket.component.html',
  styleUrls: ['./add-ticket.component.scss']
})
export class AddTicketComponent implements OnInit {
  public addTicketForm: FormGroup;

  constructor(
    public ticketService: TicketService,
    public fb: FormBuilder
  ) { }

  ngOnInit() {
    this.ticketService.getTicketsList();
    this.buildForm();
  }

  successNotification(){
    Swal.fire({
      text: 'Your ticket has been saved',
      icon: 'success',
    }).then((result) => {
      window.location.href = "./../ticket";
    })
  } 

  sources = [
    { name: 'website' },
    { name: 'Facebook' },
    { name: 'Line' },
    { name: 'Email' },
    { name: 'Telephone' },
    { name: 'Onsite' }
  ]

  types = [
    { name: 'info' },
    { name: 'consult' },
    { name: 'problem' },
    { name: 'add-ons' }
  ]

  prioritys = [
    { name: 'low' },
    { name: 'medium' },
    { name: 'high' }
  ]

  buildForm() {
    this.addTicketForm = this.fb.group({
      date: [''],
      source: [''],
      siteName: ['', [Validators.required]],
      maintenancePackage: ['', [Validators.required]],
      product: ['', [Validators.required]],
      module: [''],
      creater: ['', [Validators.required]],
      type: [''],
      subject: ['', [Validators.required]],
      priority: [''],
      description: [''],
      resolveDescription: [''],
    })
  }

  get date() {
    return this.addTicketForm.get('date');
  }

  get source() {
    return this.addTicketForm.get('source');
  }

  get siteName() {
    return this.addTicketForm.get('siteName');
  }

  get maintenancePackage() {
    return this.addTicketForm.get('maintenancePackage');
  }

  get product() {
    return this.addTicketForm.get('product');
  }

  get module() {
    return this.addTicketForm.get('module');
  }

  get creater() {
    return this.addTicketForm.get('creater');
  }

  get type() {
    return this.addTicketForm.get('type');
  }

  get subject() {
    return this.addTicketForm.get('subject');
  }

  get priority() {
    return this.addTicketForm.get('priority');
  }

  get description() {
    return this.addTicketForm.get('description');
  }

  get resolveDescription() {
    return this.addTicketForm.get('resolveDescription');
  }

  addTicketData() {
    this.ticketService.addTicket(this.addTicketForm.value);
  }
}