You can change the due date for all the invoices created by your club or for a certain set of invoices.
Change general due date settings
1. Go to "Invoicing" and click on gear icon in the top left
2. Change the "Due date" field to match the number of days you want.
3. Scroll down and click "Save"
Change due dates of a certain training group's invoices for a certain month
1. Go to "Invoicing" and click on a training group
2. Click on "More options"
3. Set the payment due date for this set of invoices and click"Apply".
If you wish to change the date displayed on the invoice, keep in mind that it should be in the month you are billing the players for. Otherwise the payment data on Sportlyzer will be displayed in a wrong period.