可以通过覆盖日期选择器的MatDateFormats提供的方法来覆盖日期或时间的输出格式。以下是一个示例，将日期输出为YYYY年MM月DD日的格式：

1. 创建一个新的文件my-date-format.ts，其中包含以下内容：

import { NativeDateAdapter, MatDateFormats } from '@angular/material/core'; import { Injectable } from '@angular/core';

@Injectable() export class MyDateAdapter extends NativeDateAdapter {

format(date: Date, displayFormat: Object): string {
    if (displayFormat === 'YYYY-MM-DD') {
        return date.getFullYear() + '年' + (date.getMonth() + 1) + '月' + date.getDate() + '日';
    } else {
        return super.format(date, displayFormat);
    }
}

}

export const MY_DATE_FORMATS: MatDateFormats = { parse: { dateInput: 'YYYY-MM-DD', }, display: { dateInput: 'YYYY-MM-DD', monthYearLabel: 'yyyy MMMM', dateA11yLabel: 'yyyy MMMM d', monthYearA11yLabel: 'yyyy MMMM', }, myDateFormat: { monthYearLabel: 'YYYY年MM月', dateA11yLabel: 'YYYY年MM月DD日', monthYearA11yLabel: 'YYYY年MM月', // This will be used by [matDatepicker] as a fallback if myDateFormat.monthYearLabel is not specified // and [matDatepickerRange] will take this as range separator format. rangeSeparator: ' - ' } };

2. 在app.module.ts文件中将MyDateAdapter和MY_DATE_FORMATS导入，如下所示：

import { MatNativeDateModule, DateAdapter, MAT_DATE_FORMATS } from '@angular/material'; import { MyDateAdapter, MY_DATE_FORMATS } from './my-date-format';

@NgModule({ imports: [ //... MatNativeDateModule, //... ], providers: [ //... { provide: DateAdapter, useClass: MyDateAdapter }, { provide: MAT_DATE_FORMATS, useValue: MY_DATE_FORMATS } //... ] })