In ccInvoices you will be able to (among other things) configure date format and invoice number format. An explanation about these configuration options can be found in the configuration itself.
- Go to the administrator of the Joomla! website
- Once you are logged in, go to Components > ccInvoices > Configuration
- You now see the configuration of ccInvoices
- Start entering your preferred settings. You can hover over the text to get an explanation of each setting.