sig
exception Parse_error of string
exception NYI of string
val weekdayname : int -> string
val monthname : int -> string
val convert : ?tz:int * int -> Unix.tm -> char -> string
val localtime : unit -> Unix.tm
val tz : unit -> int * int
val strftime : ?tz:int * int -> string -> Unix.tm -> string
val w3c : string
end