Restore Date::create() compatibility with no params

Restore the historical behavior of create() that uses the current day
by default.

Fixes #434

src/ChronosDate.php

@@ -151,8 +151,13 @@ public function __debugInfo(): array
      * @param int $day The day to create an instance with.
      * @return static
      */
-    public static function create(int $year, int $month, int $day)
+    public static function create(?int $year = null, ?int $month = null, ?int $day = null)
     {
+        $now = static::today();
+        $year = $year ?? (int)$now->format('Y');
+        $month = $month ?? $now->format('m');
+        $day = $day ?? $now->format('d');
+
         $instance = static::createFromFormat(
             'Y-m-d',
             sprintf('%s-%s-%s', 0, $month, $day)

tests/TestCase/Date/ConstructTest.php

@@ -294,6 +294,26 @@ public function testConstructWithTestNowNoMutation($class)
         $class::setTestNow(null);
     }
 
+    /**
+     * @dataProvider dateClassProvider
+     */
+    public function testCreateWithTestNowNoParams($class)
+    {
+        $class::setTestNow($class::create(2001, 1, 1));
+        $date = $class::create();
+        $this->assertDate($date, 2001, 1, 1);
+    }
+
+    /**
+     * @dataProvider dateClassProvider
+     */
+    public function testCreateWithSomeParams($class)
+    {
+        $now = $class::today();
+        $date = $class::create(2022, 1);
+        $this->assertDate($date, 2022, 1, (int)$now->format('d'));
+    }
+
     /**
      * @dataProvider dateClassProvider
      */