Is there a quick way to tell what invoices were owing at past date?

Hello Flex1, 

If you click on the all sales tab>filter>change type to invoices>you can select what status you want to see so if you want to view overdue select over due>can select the date range you want to see and which customer you need to view as well> then click apply and it will show you the information of what you have put in the filter.