Output ISO 8601 format #9967

Because it should be the most universally understood

Author: PowerKiKi

src/Api/Scalar/TimeType.php

@@ -22,7 +22,7 @@ final class TimeType extends ScalarType
     public function serialize(mixed $value): mixed
     {
         if ($value instanceof ChronosTime) {
-            return $value->format('H\hi');
+            return $value->format('H:i');
         }
 
         return $value;

tests/Api/Scalar/TimeTypeTest.php

@@ -17,12 +17,12 @@ public function testSerialize(): void
         $type = new TimeType();
         $time = new ChronosTime('14:30:25');
         $actual = $type->serialize($time);
-        self::assertSame('14h30', $actual);
+        self::assertSame('14:30', $actual);
 
         // Test serialize with microseconds
         $time = new ChronosTime('23:59:59.1254');
         $actual = $type->serialize($time);
-        self::assertSame('23h59', $actual);
+        self::assertSame('23:59', $actual);
     }
 
     /**