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Clock Laravel Package
symfony/clock
Symfony Clock decouples your app from the system clock. Inject ClockInterface to get deterministic time via now() and control behavior like sleep() and time zones. Ideal for testable, time-sensitive code without relying on global time functions.
The Symfony Clock Component decouples your code from the system time by relying on a ClockInterface instead of direct calls like new \DateTimeImmutable() or sleep(). This makes time-dependent logic easier to test, more predictable, and configurable (including optional timezone handling).
- Inject a ClockInterface to standardize time access across services
- Get current time via
now()as a \DateTimeImmutable - Pause execution with
sleep()using fractional seconds (e.g., 2.5) - Swap implementations (e.g., NativeClock) for testing or custom behavior
- Optionally enforce a timezone with
withTimeZone()
Frequently asked questions about Clock
- How do I integrate Symfony Clock with Laravel’s service container?
- Bind `ClockInterface` in Laravel’s container using `NativeClock` for production or `MockClock` for tests. Example: `$this->app->bind(ClockInterface::class, fn() => new NativeClock());`. Use Laravel’s `needs()` method for auto-wiring: `$this->app->when(YourService::class)->needs(ClockInterface::class)->give(NativeClock::class);`.
- Will Symfony Clock work with Laravel’s Carbon library?
- Yes, but they serve different purposes. Use `ClockInterface` for time abstraction (e.g., testing, timezone control) and Carbon for date manipulation. For gradual adoption, wrap Carbon in a custom `ClockInterface` implementation like `CarbonClock` to reuse existing logic.
- Can I use Symfony Clock in Laravel 9 or older versions?
- Symfony Clock requires PHP 8.1+, so Laravel 10+ is officially supported. For older versions, you’d need a polyfill or custom implementation, but the component isn’t optimized for pre-8.1 environments. Test thoroughly if attempting backporting.
- How do I mock time for unit tests with Symfony Clock?
- Inject `MockClock` in your test container and set a fixed time using `$mockClock->setTime(new DateTimeImmutable('2023-01-01'))`. This ensures deterministic test results. Example: `$this->app->bind(ClockInterface::class, fn() => new MockClock());` in your test setup.
- What’s the performance impact of using Symfony Clock in production?
- Negligible. `NativeClock` uses PHP’s native `time()` function under the hood, adding zero runtime overhead. The abstraction only affects code that explicitly depends on `ClockInterface`, so existing `Carbon::now()` calls remain unchanged.
- How do I handle timezone differences between services in Laravel?
- Use `withTimeZone()` on `ClockInterface` to enforce a service-specific timezone (e.g., `$clock->withTimeZone('UTC')`). For consistency, configure a default timezone in Laravel’s `config/app.php` and ensure all `ClockInterface` implementations respect it.
- Is Symfony Clock suitable for Laravel queue workers or event listeners?
- Absolutely. Decouple time-sensitive logic (e.g., retries, delays) from the system clock to avoid inconsistencies like Lambda cold starts. Inject `ClockInterface` into workers/listeners and use `sleep()` for reliable delays.
- How do I migrate legacy code using `time()` or `date()` to Symfony Clock?
- Wrap legacy calls in adapters or use Laravel’s Facade pattern to hide `ClockInterface` behind a `Time::now()` facade. Example: `class TimeFacade { public static function now() { return app(ClockInterface::class)->now(); }}`. Gradually replace direct calls.
- What are the alternatives to Symfony Clock for Laravel?
- For time abstraction, consider `brianium/paratest` (for parallel testing) or custom wrappers around Carbon. However, Symfony Clock is the most robust solution for production-grade time decoupling, especially when paired with Symfony’s ecosystem (e.g., Messenger).
- How do I enforce ClockInterface usage in new Laravel code?
- Use static analysis tools like PHPStan or Psalm to detect direct `time()`/`date()` calls. Enforce `ClockInterface` in PHPDoc requirements for new services. For stricter adoption, create a custom Laravel rule in `app/Providers/AppServiceProvider` to validate constructor dependencies.
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