import { array } from "../types";
/**
 * Convert date and time to a serial date number (Unix).
 *
 * Converts a given date and time to a Unix timestamp (serial date number). The function supports both date strings with a format and numeric arrays representing components of date and time.
 *
 * @param d The date input, which can be a single value or an array of date components.
 * @param fmt The format string to parse the date if the input is a date string.
 * @returns The Unix timestamp or an array of Unix timestamps.
 *
 * @example Convert a date string to a Unix timestamp
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(datenum('31-12-2014', 'DD-MM-YYYY'), 1419984000);
 *
 * ```
 *
 * @example Convert an array of date strings to an array of Unix timestamps
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(datenum(['31-12-2014', '31-01-2015'], 'DD-MM-YYYY'), [1419984000, 1422662400]);
 *
 * ```
 *
 * @example Convert an array of date components to a Unix timestamp
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(datenum([2015, 4, 5, 12, 20, 30, 0]), 1428236430);
 *
 * ```
 */
export default function datenum(d: string | array<string | number>, fmt?: string): number | array;
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