How to Convert a Custom Custom Type in a String?

I'm thinking about the cogan, right? Thereis some basic types that they have implemented. But my kind of question is like, how would you handle like these customed type athat you can create? So i'm thinking, like, on the service side, i know i can define things like a date, time or a date,. Or somethingi a date, i think t was one i defined. How would you handle a converting back and forth that? Because that's not so quear rit i actually has to take some, some custom code to do. For us, isa is an astring. Not for us, because iam not the ded teol