Invoicing uses the post date to display as a invoice created date. I followed WordPress standard method for displaying post date.
In WordPress whenever post is published it updates the post date. In invoicing whenever invoice published(paid) it updates the date also.
I will discuss this point with our team and let you know.
To open a new support ticket, first select the relevant forum and then click the "New Post" button. Example: You need support for the core plugin? Click on Core Plugin support and click on the "New Post" Button.