Create DateInfo struct

src/common/mod.rs

@@ -1,7 +1,8 @@
 mod date;
+mod date_info;
 mod expandable_info;
 mod form_schema;
 mod user;
 pub mod value_type;
 
-pub use self::{expandable_info::*, form_schema::*, user::*, value_type::*};
+pub use self::{date_info::*, expandable_info::*, form_schema::*, user::*, value_type::*};