Good Morning, and thank you for posting on the Final Fantasy XIV Technical Support Forums.

Unfortunately, we cannot validate a Game Time Card over the forums, nor do we suggest you provide the code in a public setting.

For further assistance, please contact the Japanese Support Center as the code you have is a JP code. You can get in contact with the Japanese Support Center using the following link: http://support.jp.square-enix.com/main.php?id=5381&la=0

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!