Step 1: On the member's profile
Navigate to Billing > Subscriptions > Select the subscription that you wish to change the billing date of
Step 2: Change the billing date of the subscription
Click the pencil on the invoice that you want to change the billing date for
Step 3: Edit the date
Click the option to edit the date of the invoice. This will then ensure that the member will be charged on a different billing date to the original planned billing date.