diff --git a/googleApps.mli b/googleApps.mli
index 3b487d8..37ecd99 100644
--- a/googleApps.mli
+++ b/googleApps.mli
@@ -38,6 +38,10 @@ sig
   val to_locale_date_string : t -> string [@@js.call]
 
   val to_string : t -> string [@@js.call]
+
+  val set_date : t -> date:int -> unit [@@js.call]
+  val set_month : t -> month:int -> unit [@@js.call]
+  val set_full_year: t -> year:int -> unit [@@js.call]
 end
 
 (** Files in Google Drive. *)