import { z } from 'zod';
/**
 * Type of date representation to use
 */
export declare enum DateFormatType {
    /** JavaScript Date object */
    DATE_OBJECT = "date_object",
    /** ISO 8601 string (e.g., "2023-10-15T14:30:00.000Z") */
    ISO_STRING = "iso_string",
    /** Date string in YYYY-MM-DD format */
    DATE_STRING = "date_string",
    /** UNIX timestamp in milliseconds */
    EPOCH_MS = "epoch_ms"
}
/**
 * Zod schema for validating and transforming Unix timestamp in milliseconds
 */
export declare const epochMillisSchema: z.ZodEffects<z.ZodNumber, string | number | Date | null, number>;
/**
 * Zod schema for validating and transforming ISO 8601 date strings
 */
export declare const isoDateTimeSchema: z.ZodEffects<z.ZodString, string | number | Date | null, string>;
/**
 * Zod schema for validating and transforming YYYY-MM-DD date strings
 */
export declare const dateStringSchema: z.ZodEffects<z.ZodString, string | number | Date | null, string>;
/**
 * Creates a Zod schema for query parameter dates that accepts:
 * - UNIX epoch milliseconds (number)
 * - YYYY-MM-DD formatted strings
 * - null values
 *
 * All values are transformed to UNIX epoch milliseconds or undefined (if null/undefined)
 * for API compatibility.
 *
 * @returns A Zod schema for query parameter dates
 */
export declare function createQueryDateSchema(): z.ZodEffects<z.ZodOptional<z.ZodUnion<[z.ZodNumber, z.ZodString, z.ZodNull]>>, number | undefined, string | number | null | undefined>;