How to mock a date in Jest

jest-mock-date.md

How to set a mock date in Jest

To mock a date in Jest, we can use the useFakeTimers and setSysttemTime methods.

jest
  .useFakeTimers('modern')
  .setSystemTime(new Date('2020-08-09'));

For clean up, you can reset it with

jest.useRealTimers()

One of the places you can cleanup is in afterEach(), likewise you can apply the mock dates for all tests in beforeEach(). e.g.

beforeEach(() => {
    jest.useFakeTimers('modern')
        .setSystemTime(new Date('2020-08-09'))
})

afterEach(() => {
    jest.runOnlyPendingTimers()
    jest.useRealTimers()
})