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Clock Laravel Package
symfony/clock
Symfony Clock decouples your code from the system clock. Inject ClockInterface to get DateTimeImmutable via now(), control timezones, and pause execution with sleep(). Ideal for testable, time-sensitive services without relying on global time.
Decouples applications from the system clock
Frequently asked questions about Clock
- How do I integrate Symfony Clock into a Laravel application?
- Use Composer to install it (`composer require symfony/clock`), then bind `ClockInterface` in Laravel’s service container. For example, register `NativeClock` as a singleton in `AppServiceProvider` or inject it directly into services. Replace `now()` calls with `$clock->now()` and `sleep()` with `$clock->sleep()`.
- Will Symfony Clock break existing Carbon or DateTime usage in Laravel?
- No, it won’t break existing code. Symfony Clock works alongside Carbon and DateTime. You can incrementally adopt it by injecting `ClockInterface` only where needed (e.g., tests, jobs, or time-sensitive services) without changing legacy code.
- Can I use Symfony Clock for testing time-sensitive Laravel features?
- Yes, it’s ideal for testing. Replace `Carbon::setTestNow()` or `travel()` with `MockClock` to simulate time in tests. This makes tests deterministic and eliminates flaky time-based assertions. Works seamlessly with Laravel’s testing tools.
- Does Symfony Clock support Laravel’s job queues (e.g., Horizon) for delays?
- Absolutely. Replace `sleep()` or `usleep()` in jobs with `$clock->sleep()` for predictable delays. This ensures consistent behavior across environments, including retries and exponential backoff in queue workers.
- How do I enforce a specific timezone (e.g., UTC) for all services?
- Configure a default timezone by wrapping `NativeClock` with `withTimeZone('UTC')` in your service container binding. This ensures all services use UTC, preventing timezone-related bugs in production or global deployments.
- Is Symfony Clock compatible with Laravel 10/11 and PHP 8.1+?
- Yes, Symfony Clock requires PHP 8.1+ (for Symfony 7+) or 8.4+ (for Symfony 8+). It works with Laravel 10/11 out of the box. Check your `composer.json` constraints to avoid version conflicts.
- Can I use Symfony Clock for event sourcing or replaying past events?
- Yes, Symfony Clock supports time-warping. You can simulate past/future timestamps by injecting a custom clock (e.g., `MockClock` with a fixed time) to replay events or debug race conditions in event-driven architectures.
- What’s the performance impact of using Symfony Clock vs. native PHP functions?
- The performance impact is negligible. `NativeClock` uses `DateTimeImmutable`, which is optimized in PHP. For delays, `$clock->sleep()` is functionally equivalent to `sleep()` but more predictable in tests and distributed systems.
- Are there alternatives to Symfony Clock for Laravel?
- Alternatives include Laravel’s built-in `Carbon` with `setTestNow()` or `travel()`, or third-party packages like `spatie/laravel-timezone`. However, Symfony Clock is more robust for production use, offering better testability, timezone control, and integration with Symfony’s ecosystem.
- How do I migrate from Carbon’s time helpers (e.g., `now()`, `sleep()`) to Symfony Clock?
- Start by injecting `ClockInterface` into new classes or services. Use `$clock->now()` instead of `now()` and `$clock->sleep()` instead of `sleep()`. For existing code, refactor incrementally—prioritize time-sensitive logic like subscriptions, rate limiting, or feature flags. Use IDE refactoring tools to replace calls systematically.
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