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How to set a mock date in Jest?

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

For instance, we write:

jest
  .useFakeTimers()
  .setSystemTime(new Date('2022-01-01').getTime());

to call useFakeTimers to let us mock timers.

Then we call setSystemTime to set the time of the mock timer by calling it with a timestamp in milliseconds.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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