(* TODO time
   uhuh!
   need to be int64 for binary/pg round trip

   really need to fix this module *)

type t = Ptime.t option
type span = Ptime.Span.t option

module Span : sig
  type t = span

  val jsont : t Jsont.t
  val bin : t Bin.t
  val bin_nbo : t Bin.t
  val caqti : t Caqti_type.t
end

val diff : t -> t -> span
val add_span_exn : t -> span -> t
val of_span_exn : span -> t
val compare : t -> t -> int option

(* - *)
val jsont : t Jsont.t
val bin : t Bin.t
val bin_nbo : t Bin.t
val caqti : t Caqti_type.t