sig
type t =
GT of Core.Std.Date.t
| LT of Core.Std.Date.t
| Between of Core.Std.Date.t * Core.Std.Date.t
| On of Core.Std.Date.t
type selector = t
type value = Core.Std.Date.t
val eval : selector -> value -> bool
val t_of_sexp : Sexplib.Sexp.t -> Selector.Date_selector.t
end