A pre-release of the proposed PSR-20 Clock-Interface

0.1.7 2022-11-25 16:15 UTC

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Last update: 2024-04-25 19:13:06 UTC


An implementation of the proposed PSR-20 clock-interface

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composer require stella-maris/clock


This interface allows one to inject one of the implemntations that provide the clock-interface.

use StellaMaris/Clock/CLockInterface;

final class PastChecker
    public function __construct(private ClockInterface $clock) {}
    public function hasDateTimeAlreadyPassed(DateTimeImmutable $item): bool
        return $item < $this->clock->now();


Within the Framework Interoperability Group (FIG) a working group has started in 2021 to create a ClockInterface. The works on that have been rather fast and already in the mid of 2021 the interface was more or less finally decided upon.

So why this Interface?

Since mid 2021 no further work has been happening on the Working Group. All requests towards the editor and the sponsor weren't met with any reaction.

So after a lot of discussions on the official working group channel I decided to bring this interface forward by providing the currently agreed upon interface as a separate package on packagist.

But what when the PSR Interface is provided?

There are two possibilities:

  • Either the interface will be provided by the FIG as it is currently, then this interface will extend the PSR-20 one so that all implementations of this interface will be immediately PSR20 compatible.
  • Or the PSR20 interface will look different: Then all current implementations will need to provide a spearate implementation for PSR20 compatibility and this interface will simply coexist with the PSR20 one.


For a more thorough information about the interface please check the PSR-20 documentation at https://github.com/php-fig/fig-standards/blob/master/proposed/clock.md and https://github.com/php-fig/fig-standards/blob/master/proposed/clock-meta.md