Timezone Handling in Tests

Always Use TZ=UTC

When running tests in the Cal.com repository, use the TZ=UTC environment variable:

bash

TZ=UTC yarn test

This ensures consistent timezone handling and prevents timezone-related test failures that might occur when tests are run in different environments or by different developers with varying local timezone settings.

Why This Matters

Tests may pass locally but fail in CI (or vice versa)
Date/time assertions become unpredictable
Debugging timezone issues is time-consuming

Test Commands

bash

# Unit tests
TZ=UTC yarn test

# Specific test file
TZ=UTC yarn vitest run path/to/file.test.ts

# E2E tests (already configured in yarn e2e)
PLAYWRIGHT_HEADLESS=1 yarn e2e