message: expose the date objects
diff: @@ -21,7 +21,7 @@ pub use self::header::{
  pub use self::headerraw::HeaderRaw;
  pub use self::version::*;
  -pub use crate::date::{BlockDate, BlockDateParseError};
  +pub use crate::date::{BlockDate, BlockDateParseError, Epoch, SlotId};
  /// `Block` is an element of the blockchain it contains multiple
  /// transaction and a reference to the parent block. Alongside
  