Move the Date struct into types and implement a get_property_numeric.

src/error/error.rs

@@ -9,6 +9,7 @@ pub enum CustomError<I> {
     MyError(MyError<&'static str>),
     Nom(I, ErrorKind),
     IO(std::io::Error),
+    BoxedError(Box<dyn std::error::Error>),
 }
 
 #[derive(Debug)]
@@ -36,3 +37,9 @@ impl<I> From<&'static str> for CustomError<I> {
         CustomError::MyError(MyError(value))
     }
 }
+
+impl<I> From<Box<dyn std::error::Error>> for CustomError<I> {
+    fn from(value: Box<dyn std::error::Error>) -> Self {
+        CustomError::BoxedError(value)
+    }
+}