日期选择器中的日期值被更改

Question

我为日期选择器编写了如下的控件值访问器，

import { Component, Input, OnInit, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
import { MatDatepickerInputEvent } from '@angular/material/datepicker';
import * as _moment from 'moment';
import {default as _rollupMoment} from 'moment';
const moment = _rollupMoment || _moment;

@Component({
  selector: 'app-date-picker',
  template: `
  <mat-form-field  placeholder="date" appearance="outline">
      <mat-label>{{title}}</mat-label>
      <mat-datepicker-toggle matPrefix [for]="picker"></mat-datepicker-toggle>
      <input matInput [matDatepicker]="picker" [value]="dateValue" (dateInput)="addEvent('input', $event)" [placeholder]="title">
      <mat-datepicker touchUi="true" #picker></mat-datepicker>
  </mat-form-field>
  `,
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => DatePickerComponent),
      multi: true
    }
  ],
  styleUrls: ['./date-picker.component.scss']
})
export class DatePickerComponent implements ControlValueAccessor {

  constructor() { }

  @Input()
  _dateValue; // notice the '_'

  @Input() title: string;

  get dateValue() {
    return moment(this._dateValue, 'YYYY-MM-DD HH:mm:ss');
  }

  set dateValue(val) {
    this._dateValue = moment(val).format('YYYY-MM-DD HH:mm:ss');
    this.propagateChange(this._dateValue);
  }

  addEvent(type: string, event: MatDatepickerInputEvent<Date>) {
    // console.log(event.value);
    this.dateValue = moment(event.value, 'YYYY-MM-DD HH:mm:ss');
  }

  writeValue(value: any) {
    if (value !== undefined) {
      this.dateValue = moment(value, 'YYYY-MM-DD HH:mm:ss');
    }
  }
  propagateChange = (_: any) => { };

  registerOnChange(fn) {
    this.propagateChange = fn;
  }

  registerOnTouched() { }

}

我正在html组件中使用上述日期选择器，如下所示，

  <app-date-picker [ngModel]="toDate" class="form" [title]="'To'" formControlName="toDate"></app-date-picker>

在component.ts文件中，我有一个包含formControlName的表单，

 this.myDate = new Date();
    this.toDate =  this.datepipe.transform(this.myDate, 'dd/MM/yyyy');
    console.log(this.toDate);

 this.issueSearchForm = this.formBuilder.group(
      {
        userId: [''],
        isMobileNo: [''],
        fromDate: [''],
        toDate: [this.toDate, Validators.required],
        issueType: [this.defaultIssueType, Validators.required]
      }
    );

console.log输出显示值为

  

01/10/2018

但是在选择器组件中，将其设置为

  

2001/10/20

我要去哪里了，请帮助我。