import { z } from 'zod';
export declare const OPERATIONAL_DATE_FORMAT = "yyyyMMdd";
export type OperationalDate = string & {
    __brand: 'OperationalDate';
};
export declare const operationalDateSchema: z.ZodBranded<z.ZodEffects<z.ZodString, OperationalDate, string>, "OperationalDate">;
/**
 * This function validates if a string is a valid operational date.
 * Throws an error if the date is invalid.
 * @param date - The date to be validated.
 * @returns The given string as an OperationalDate.
 */
export declare function validateOperationalDate(date: string): OperationalDate;