import type { UnixUnit } from "../validate/index.js";
/**
 * Return the hour (0-23) from a unix epoch value.
 *
 * - Delegates to {@link parseUnitFromUnix} with unit "hour".
 * - Returns "" for invalid input.
 *
 * @param value unix epoch in milliseconds or seconds (number or string)
 * @param options optional: epochUnit ("seconds" | "milliseconds"), timeZone (IANA)
 * @returns Hour (00-23) or "" on invalid input
 *
 * @example parseHourFromUnix(1700000000000) // "05"
 * @example parseHourFromUnix(-86400, { epochUnit: "seconds" }) // "00"
 */
export declare function parseHourFromUnix(value: number | string, options?: {
    epochUnit?: UnixUnit;
    timeZone?: string;
}): string;