New in Project Timer v1.1.2.0 is the ability to create and manage invoices based on your time-tracking activities.
In this post you can check out a set of screenshots to see how this works:

Select a set of activities from a Project and “Make invoice”:

Project Timer invoicing

 

You can add the activities to a “New” invoice or to an existing one:

Invoice settings Project Timer

 

Enter extra details about the invoice:

Extra detail information invoice

 

Make a preview of the invoice:

invoice preview in project timer

Once “Invoiced” you cannot change it anymore. (If needed you can set it back to draft for editing):

invoiced-done-not-editable

The activities will be connected to the invoice number:

 

projecttimer-invoice-module-01f

You can archive the project or set the status to closed so they will not be visable:

projecttimer-invoice-module-01g