import { z } from "zod";
/**
 * Validates if a string is a valid date in any of the supported formats
 * Supported formats:
 * - YYYY-MM-DD (2024-03-18)
 * - DD-MM-YYYY (18-03-2024)
 * - YYYY/MM/DD (2024/03/18)
 * - DD/MM/YYYY (18/03/2024)
 */
export declare const dateValidator: z.ZodEffects<z.ZodString, string, string>;
/**
 * Normalizes any supported date format to YYYY-MM-DD for database queries
 */
export declare const normalizeDate: (dateStr: string) => string;
/**
 * Creates a date schema that can be required or optional
 */
export declare const createDateSchema: (required?: boolean) => z.ZodEffects<z.ZodString, string, string> | z.ZodOptional<z.ZodEffects<z.ZodString, string, string>>;
/**
 * Date range schema for filtering between two dates
 */
export declare const dateRangeSchema: z.ZodEffects<z.ZodObject<{
    fromDate: z.ZodOptional<z.ZodEffects<z.ZodString, string, string>>;
    toDate: z.ZodOptional<z.ZodEffects<z.ZodString, string, string>>;
}, "strip", z.ZodTypeAny, {
    fromDate?: string | undefined;
    toDate?: string | undefined;
}, {
    fromDate?: string | undefined;
    toDate?: string | undefined;
}>, {
    fromDate?: string | undefined;
    toDate?: string | undefined;
}, {
    fromDate?: string | undefined;
    toDate?: string | undefined;
}>;
export declare const yyyyMmDdSchema: z.ZodString;
export declare const ddMmYyyySchema: z.ZodString;