import { type UnixUnit } from "../validate/index.js";
/**
 * Extract the date portion from a unix epoch value.
 *
 * - Converts to ZonedDateTime then extracts the PlainDate.
 * - Uses system timezone if not specified.
 * - Returns "" for invalid input.
 *
 * @param value unix epoch in milliseconds or seconds (number)
 * @param options optional: epochUnit ("seconds" | "milliseconds"), timeZone (IANA)
 * @returns ISO date string (e.g., "2024-03-17") or "" on invalid input
 *
 * @example parseDateFromUnix(1700000000000) // "2023-11-15"
 * @example parseDateFromUnix(1700000000, { epochUnit: "seconds" }) // "2023-11-15"
 * @example parseDateFromUnix(-86400, { epochUnit: "seconds" }) // "1969-12-31"
 */
export declare function parseDateFromUnix(value: number, options?: {
    epochUnit?: UnixUnit;
    timeZone?: string;
}): string;