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+# PSR Clock
+
+This repository holds the interface for [PSR-20][psr-url].
+
+Note that this is not a clock of its own. It is merely an interface that
+describes a clock. See the specification for more details.
+
+## Installation
+
+```bash
+composer require psr/clock
+```
+
+## Usage
+
+If you need a clock, you can use the interface like this:
+
+```php
+<?php
+
+use Psr\Clock\ClockInterface;
+
+class Foo
+{
+    private ClockInterface $clock;
+
+    public function __construct(ClockInterface $clock)
+    {
+        $this->clock = $clock;
+    }
+
+    public function doSomething()
+    {
+        /** @var DateTimeImmutable $currentDateAndTime */
+        $currentDateAndTime = $this->clock->now();
+        // do something useful with that information
+    }
+}
+```
+
+You can then pick one of the [implementations][implementation-url] of the interface to get a clock.
+
+If you want to implement the interface, you can require this package and
+implement `Psr\Clock\ClockInterface` in your code. 
+
+Don't forget to add `psr/clock-implementation` to your `composer.json`s `provides`-section like this:
+
+```json
+{
+  "provides": {
+    "psr/clock-implementation": "1.0"
+  }
+}
+```
+
+And please read the [specification text][specification-url] for details on the interface.
+
+[psr-url]: https://www.php-fig.org/psr/psr-20
+[package-url]: https://packagist.org/packages/psr/clock
+[implementation-url]: https://packagist.org/providers/psr/clock-implementation
+[specification-url]: https://github.com/php-fig/fig-standards/blob/master/proposed/clock.md