要模拟toISOString，你可以这样做:

jest.spyOn(global.Date.prototype, 'toISOString').mockReturnValue('01-01-2001 00:00:00')

因为momentjs内部使用Date，所以你可以重写Date。现在函数总是返回相同的时刻。

Date.now = jest.fn(() => 1487076708000) //14.02.2017

or

Date.now = jest.fn(() => new Date(Date.UTC(2017, 1, 14)).valueOf())

MockDate可以在玩笑测试中使用，以改变new Date()返回的内容:

var MockDate = require('mockdate');
// I use a timestamp to make sure the date stays fixed to the ms
MockDate.set(1434319925275);
// test code here
// reset to native Date()
MockDate.reset();

你可以用date-faker。允许您相对地更改当前日期:

import { dateFaker } from 'date-faker';
// or require if you wish: var { dateFaker } = require('date-faker');

// make current date to be tomorrow
dateFaker.add(1, 'day'); // 'year' | 'month' | 'day' | 'hour' | 'minute' | 'second' | 'millisecond'.

// change using many units
dateFaker.add({ year: 1, month: -2, day: 3 });

// set specific date, type: Date or string
dateFaker.set('2019/01/24');

// reset
dateFaker.reset();

自Jest版本29以来，您还可以执行以下操作:

jest.useFakeTimers({
  now: 1673445238335,
});

允许以下选项:

type FakeTimersConfig = {
  /**
   * If set to `true` all timers will be advanced automatically by 20 milliseconds
   * every 20 milliseconds. A custom time delta may be provided by passing a number.
   * The default is `false`.
   */
  advanceTimers?: boolean | number;
  /**
   * List of names of APIs that should not be faked. The default is `[]`, meaning
   * all APIs are faked.
   */
  doNotFake?: Array<FakeableAPI>;
  /**
   * Use the old fake timers implementation instead of one backed by `@sinonjs/fake-timers`.
   * The default is `false`.
   */
  legacyFakeTimers?: boolean;
  /** Sets current system time to be used by fake timers. The default is `Date.now()`. */
  now?: number | Date;
  /**
   * The maximum number of recursive timers that will be run when calling `jest.runAllTimers()`.
   * The default is `100_000` timers.
   */
  timerLimit?: number;
};

你可以在文档中读到更多。

@pranava-s-balugari的回复有所改善

它不影响新日期(某事) 模拟日期可以更改。 它将工作日期。现在太

const DateOriginal = global.Date;

global.Date = class extends DateOriginal {
    constructor(params) {
        if (params) {
          super(params)
        } else if (global.Date.NOW === undefined) {
          super()
        } else {
          super(global.Date.NOW)
        }
    }
    static now () {
      return new Date().getTime();
    }
}

afterEach(() => {
  global.Date.NOW = undefined;
})

afterAll(() => {
  global.Date = DateOriginal;
});

describe('some test', () => {
  afterEach(() => NOW = undefined);

  it('some test', () => {
     Date.NOW = '1999-12-31T23:59:59' // or whatever parameter you could pass to new Date([param]) to get the date you want


     expect(new Date()).toEqual(new Date('1999-12-31T23:59:59'));
     expect(new Date('2000-01-01')).toEqual(new Date('2000-01-01'));
     expect(Date.now()).toBe(946681199000)

     Date.NOW = '2020-01-01'

     expect(new Date()).toEqual(new Date('2020-01-01'));
  })
})