Provide PSR-20 Clock implementation

composer.json

@@ -25,12 +25,16 @@
         "source": "https://github.com/cakephp/chronos"
     },
     "require": {
-        "php": ">=8.1"
+        "php": ">=8.1",
+        "psr/clock": "^1.0"
     },
     "require-dev": {
         "cakephp/cakephp-codesniffer": "^5.0",
         "phpunit/phpunit": "^10.1.0"
     },
+    "provide": {
+        "psr/clock-implementation": "1.0"
+    },
     "autoload": {
         "psr-4": {
             "Cake\\Chronos\\": "src/"

src/ClockFactory.php

@@ -0,0 +1,48 @@
+<?php
+declare(strict_types=1);
+
+namespace Cake\Chronos;
+
+/**
+ * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ * @copyright     Copyright (c) Daniel Opitz
+ * @link          https://cakephp.org CakePHP(tm) Project
+ * @license       https://www.opensource.org/licenses/mit-license.php MIT License
+ */
+
+use DateTimeImmutable;
+use DateTimeZone;
+use Psr\Clock\ClockInterface;
+
+/**
+ * PSR-20 Clock implementation.
+ */
+class ClockFactory implements ClockInterface
+{
+    private DateTimeZone|string|null $timezone;
+
+    /**
+     * Constructor.
+     *
+     * @param \DateTimeZone|string|null $timezone The timezone
+     */
+    public function __construct(DateTimeZone|string|null $timezone = null)
+    {
+        $this->timezone = $timezone;
+    }
+
+    /**
+     * Returns the current time object.
+     *
+     * @return \Cake\Chronos\Chronos The current time
+     */
+    public function now(): DateTimeImmutable
+    {
+        return Chronos::now($this->timezone);
+    }
+}

tests/TestCase/ClockFactoryTest.php

@@ -0,0 +1,44 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
+ * @link          https://cakephp.org CakePHP(tm) Project
+ * @license       https://www.opensource.org/licenses/mit-license.php MIT License
+ */
+
+namespace Cake\Chronos\Test\TestCase;
+
+use Cake\Chronos\Chronos;
+use Cake\Chronos\ClockFactory;
+use DateTimeZone;
+
+class ClockFactoryTest extends TestCase
+{
+    public function testNow(): void
+    {
+        Chronos::setTestNow('2001-01-31 12:13:14.123456');
+
+        $clock = new ClockFactory();
+        $now = $clock->now();
+
+        $this->assertSame('2001-01-31', $now->toDateString());
+    }
+
+    public function testConstructWithTimezone(): void
+    {
+        Chronos::setTestNow('2024-01-31 12:13:14.123456');
+
+        $londonTimezone = new DateTimeZone('Europe/London');
+        $clock = new ClockFactory($londonTimezone);
+        $now = $clock->now();
+
+        $this->assertSame('2024-01-31', $now->toDateString());
+        $this->assertSame('Europe/London', $now->getTimezone()->getName());
+    }
+}