If you need to change the billing date of your clients, you can follow these steps:
1. Go to the Clients tab and find the client you want to change the billing cycle of, then click on the Edit button.
2. Click on the Plans tab and look for the plan you want to change. Then click on the 3 dots and Edit.
3. Hover the mouse on the date field and choose the date you want to change it to and then click Save. You can see the date has now been updated.