import { z } from 'zod';
export type Timestamp = string & {
    __timestamp: never;
};
export declare function asTimestamp(input: unknown): Timestamp | null;
export declare const Timestamp: z.ZodEffects<z.ZodUnknown, Timestamp, unknown>;
export declare const MaybeTimestamp: z.ZodCatch<z.ZodNullable<z.ZodEffects<z.ZodUnknown, Timestamp, unknown>>>;