sig
type t
val empty : t
val add : t -> t -> t
val sub : t -> t -> t
val opp : t -> t
val equal : t -> t -> bool
val compare : t -> t -> int
val hash : t -> int
val length : Time_sig.S.t -> Time_sig.S.second
val mul : Time_sig.S.t -> Time_sig.S.t -> Time_sig.S.t
val div : Time_sig.S.t -> Time_sig.S.t -> Time_sig.S.t
val make : int -> int -> Time_sig.S.second -> Time_sig.S.t
val lmake :
?hour:int ->
?minute:int -> ?second:Time_sig.S.second -> unit -> Time_sig.S.t
val hour : int -> Time_sig.S.t
val minute : int -> Time_sig.S.t
val second : Time_sig.S.second -> Time_sig.S.t
val to_seconds : Time_sig.S.t -> Time_sig.S.second
val to_minutes : Time_sig.S.t -> float
val to_hours : Time_sig.S.t -> float
end