/**
 * Creates a date object that's between the two dates given. If a valid date cannot be created with
 * the given inputs, a date is created that is at least earlier than the given endDate.
 *
 * @param startDate Optional. The earlier (date wise) bounds for creating the new Date object. If
 *   this is not provided, a date is created that is as close to, but earlier than, the given
 *   endDate.
 * @param endDate Required. The later bounds for creating the new Date object.
 * @param monthNumber Month number for the new Date object. This is 1 indexed. So a `1` here
 *   corresponds to January.
 * @param dayNumber Number for the month for the new Date object. This is 1 indexed; the first day
 *   of the mont is `1`.
 */
export declare function dateWithinRange(startDate: Date | undefined, endDate: Date, monthNumber: number, dayNumber: Number): Date;