import type { UnixUnit } from "../validate/index.js";
/**
 * Return the day of month (1-31) from a unix epoch value.
 *
 * - Delegates to {@link parseUnitFromUnix} with unit "day".
 * - Returns "" for invalid input.
 *
 * @param value unix epoch in milliseconds or seconds (number or string)
 * @param options optional: epochUnit ("seconds" | "milliseconds"), timeZone (IANA)
 * @returns Day (01-31) or "" on invalid input
 *
 * @example parseDayFromUnix(1700000000000) // "15"
 * @example parseDayFromUnix(-86400, { epochUnit: "seconds" }) // "31"
 */
export declare function parseDayFromUnix(value: number | string, options?: {
    epochUnit?: UnixUnit;
    timeZone?: string;
}): string;