(** Convert string to time in ISO format. If [~localtime] is true
then it uses localtime, else UTC. *)
+val string_startswith : string -> string -> bool
+(** [string_startswith str prefix] returns true iff [str] starts
+ with [prefix]. *)
+
val string_endswith : string -> string -> bool
(** [string_endswith str suffix] returns true iff [str] ends with [suffix]. *)