Fix DateTimeImmutable::createFromInterface error

Author: Yann Eugoné

lib/DateTimeImmutable.php

@@ -239,6 +239,16 @@ public static function createFromMutable($dateTime): self
         return self::createFromRegular($date);
     }
 
+    public static function createFromInterface(\DateTimeInterface $object): self
+    {
+        if ($object instanceof \DateTime) {
+            $object = self::createFromMutable($object);
+        } elseif ($object instanceof DateTimeImmutable) {
+            $object = $object->getInnerDateTime();
+        }
+        return self::createFromRegular($object);
+    }
+
     /**
      * @param mixed[] $array
      * @return DateTimeImmutable

tests/DateTimeImmutableTest.php

@@ -18,4 +18,24 @@ public function testCreateFromMutable(): void
 
         self::assertSame($safeDate->format(\DateTimeInterface::ATOM), $safeImmutableDate->format(\DateTimeInterface::ATOM));
     }
+
+    /**
+     * @dataProvider createFromInterfaces
+     */
+    public function testCreateFromInterface(\DateTimeInterface $dateTime): void
+    {
+        $safeImmutableDate = \Safe\DateTimeImmutable::createFromInterface($dateTime);
+
+        self::assertSame($dateTime->format(\DATE_ATOM), $safeImmutableDate->format(\DATE_ATOM));
+    }
+
+    public function createFromInterfaces(): array
+    {
+        return [
+            [new \DateTime('2022-11-29T14:17:34+00:00')],
+            [new \Safe\DateTime('2022-11-29T14:17:34+00:00')],
+            [new \DateTimeImmutable('2022-11-29T14:17:34+00:00')],
+            [new \Safe\DateTimeImmutable('2022-11-29T14:17:34+00:00')],
+        ];
+    }
 }