You can check the scheduled payment date on the Library tab your account.
1. Log in using the Login icon located in the top right of the page at japantimes.co.jp or from this link
*The login window will appear when you are not logged in.
2. You can view your billing schedule here. Monthly and annual subscription payments typically occur on the same date (or the applicable date of the following month) so you can see when your next payment will take place.