refactor: extract getDateTimeFormat() method

Author: kenjis

system/DataCaster/Cast/DatetimeCast.php

@@ -43,12 +43,7 @@ public static function get(
         /**
          * @see https://www.php.net/manual/en/datetimeimmutable.createfromformat.php#datetimeimmutable.createfromformat.parameters
          */
-        $format = match ($params[0] ?? '') {
-            ''      => $helper->dateFormat['datetime'],
-            'ms'    => $helper->dateFormat['datetime-ms'],
-            'us'    => $helper->dateFormat['datetime-us'],
-            default => throw new InvalidArgumentException('Invalid parameter: ' . $params[0]),
-        };
+        $format = self::getDateTimeFormat($params, $helper);
 
         return Time::createFromFormat($format, $value);
     }
@@ -68,13 +63,23 @@ public static function set(
             throw new InvalidArgumentException($message);
         }
 
-        $format = match ($params[0] ?? '') {
-            ''      => $helper->dateFormat['datetime'],
-            'ms'    => $helper->dateFormat['datetime-ms'],
-            'us'    => $helper->dateFormat['datetime-us'],
-            default => throw new InvalidArgumentException('Invalid parameter: ' . $params[0]),
-        };
+        $format = self::getDateTimeFormat($params, $helper);
 
         return $value->format($format);
     }
+
+    /**
+     * Gets DateTime format from the DB connection.
+     *
+     * @param list<string> $params Additional param
+     */
+    protected static function getDateTimeFormat(array $params, BaseConnection $db): string
+    {
+        return match ($params[0] ?? '') {
+            ''      => $db->dateFormat['datetime'],
+            'ms'    => $db->dateFormat['datetime-ms'],
+            'us'    => $db->dateFormat['datetime-us'],
+            default => throw new InvalidArgumentException('Invalid parameter: ' . $params[0]),
+        };
+    }
 }