请参阅文档。
只需使用:

import { Component, VERSION, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, Validators } from '@angular/forms';
import $ from 'jquery';
import datepickerFactory from 'jquery-datepicker';

datepickerFactory($);

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent implements OnInit {
  name = 'Angular ' + VERSION.major;

  public dialogFormGroup: FormGroup;

  constructor(private formBuilder: FormBuilder){}

  ngOnInit() {
    this.dialogFormGroup = this.formBuilder.group({
      creditTerminationDate: ['', Validators.required]
    });
    let that = this;
    $( "#datepicker" ).datepicker({
            dateFormat: "dd/mm/yy",
            onSelect: function (dateText) {
              that.dialogFormGroup.get('creditTerminationDate').setValue(dateText);
              that.dialogFormGroup.get('creditTerminationDate').markAsTouched();
              that.dialogFormGroup.get('creditTerminationDate').updateValueAndValidity();              
              console.log('creditTerminationDate validity');
              console.log(that.dialogFormGroup.get('creditTerminationDate').valid);

            }
        });
  }  
}