Module Date.Period

module Period: sig  end

include S

val make : int -> int -> int -> Date.t

val lmake : ?year:int -> ?month:int -> ?day:int -> unit -> Date.t

val year : int -> Date.t

val month : int -> Date.t

val week : int -> Date.t

val day : int -> Date.t

exception Not_computable

val nb_days : Date.t -> int