/**
 * Parse an RFC 5322 (RFC 2822) date-time string — the fixed grammar email
 * `Date:` headers use — into a zoned ISO 8601 datetime string.
 *
 * - **Decoding, not display.** Accepts English weekday/month abbreviations
 *   only, per the fixed grammar (see `formatRfc2822`'s JSDoc and roadmap
 *   Decision 1).
 * - Accepts a leading day-of-week (not cross-validated against the computed
 *   date, the same deliberate scope limit `parseDateTimeWithPattern`/J11
 *   uses for its `EEEE`/`EEE` tokens) and an optional `:ss` seconds field.
 * - Accepts a 1- or 2-digit day (the formal grammar's `1*2DIGIT`), unlike
 *   `parseHttp`/`parseSql`, which both require exactly 2 digits.
 * - Accepts a numeric `+HHMM`/`-HHMM` offset or one of RFC 5322's obsolete
 *   named zones (`GMT`, `UT`, and the eight North American zones); any other
 *   obs-zone letter is unrecognized and rejected.
 * - The resulting offset becomes the zoned string's time zone identifier
 *   (e.g. `-05:00`), since RFC 2822 carries no IANA zone name to recover.
 *
 * @param value RFC 5322 date-time string (e.g. "Fri, 15 Mar 2024 14:30:00 -0400")
 * @returns zoned ISO 8601 datetime string, or "" on invalid input
 *
 * @example parseRfc2822("Fri, 15 Mar 2024 14:30:00 -0400") // "2024-03-15T14:30:00-04:00[-04:00]"
 * @example parseRfc2822("5 Jan 2024 09:00:00 GMT") // "2024-01-05T09:00:00+00:00[+00:00]"
 * @example parseRfc2822("not a date") // ""
 */
export declare function parseRfc2822(value: string): string;