Components using Date objects produce different snapshots in different timezones

Question

I\'m using Enzyme with enzyme-to-json to do Jest snapshot testing of my React components. I\'m testing shallow snapshots of a DateRange component that renders a

Answer 1

I struggled with this for hours/days and only this worked for me:

1) In your test:

Date.now = jest.fn(() => new Date(Date.UTC(2017, 7, 9, 8)).valueOf())

2) Then change the TZ env var before running your tests. So the script in my package.json:

• (Mac & Linux only)

  "test": "TZ=America/New_York react-scripts test --env=jsdom",
  

• (Windows)

  "test": "set TZ=America/New_York && react-scripts test --env=jsdom",