For one month subscriptions: You are charged at the time of signup and then the same date each month based on that signup date.
For 3/6/12 month subscriptions: You are charged at the time of signup and then the same date each subscription period based on that signup date.
For example, if you signed up on the 28th then your renewal would be the 28th of each 3/6/12 months.
PLEASE NOTE: If your subscription signup is between the 11th and 27th of a month for any length of subscription, your renewal will be moved to the 10th of the following subscription period. This will be reflected on your user account. The frequency of the renewal will follow the same dates indicated above.