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(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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include module type of struct
  include Time
end

type time = t

val pp : Format.formatter -> t -> unit

val of_seconds_string : string -> time option

val to_seconds_string : time -> string

(** [( +? ) t p] adds a time span [p] to a timestamp [t].
    This function errors on integer overflow *)
val ( +? ) : time -> Period_repr.t -> time tzresult

(** [( -? ) t1 t2] subtracts timestamp [t2] from [t1].
    This function errors when the difference is negative *)
val ( -? ) : time -> time -> Period_repr.t tzresult