import { type UnixUnit } from "../validate/index.js";
/**
 * Return the day of week (1-7) from a unix epoch value.
 *
 * - Monday=1 through Sunday=7.
 * - Returns null for invalid input.
 *
 * @param value unix epoch in milliseconds or seconds (number or string)
 * @param options optional: epochUnit ("seconds" | "milliseconds"), timeZone (IANA)
 * @returns Day of week (1-7) or null on invalid input
 *
 * @example parseDayOfWeekFromUnix(1704067200000) // 1
 * @example parseDayOfWeekFromUnix(-86400, { epochUnit: "seconds" }) // 2
 */
export declare function parseDayOfWeekFromUnix(value: number | string, options?: {
    epochUnit?: UnixUnit;
    timeZone?: string;
}): number | null;