add a testTZ/testTimeZone config value like testURL but for setting a timezone tests should run in

[wldcordeiro]

#8497 🚀 Feature Proposal

Motivation

Enforcing a consistent timezone in an easily configurable way just like setting a base URL.

Example

// in a jest.config.js
module.exports = {
  setupFilesAfterEnv: './setup.js',
  testTZ: 'America/Denver',
  testURL: 'http://localhost',
}

Pitch

Sometimes even with mocks you run into problems of you and another dev in another timezone producing different results because of your computer timezones. You could do something like TZ=foo jest as a workaround and put that in your package.json as well but then if you have a Windows user doing dev you now need something like cross-env to work around the variables.

[ide]

As of Node 13+ you can set process.env.TZ in your globalSetup function (NB I haven't tried this on Windows).

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