Helper Classes

[besserwisser]

Hey :) Thanks for the awesome book, I enjoyed it!

One question regarding helper stuff like classes for date calculations, formatting, etc.

Where do they live in your architecture? Are they used via output ports in the application layer (e.g. injected into the use case)? So you define a interface and store it in the port out folder. And the implementation of the interface is in the adapter out folder? Or do you put this stuff in the "common" folder?

Thank you 🙏