import type { Temporal } from "../types.js";
/**
 * Returns a string in RFC 7231's format which represents an exact time of given temporal object.
 * Units smaller than second are ignored (rounded down).
 *
 * @param dt temporal object which includes exact time info (`Instant` and `ZonedDateTime`)
 * @returns a string formatted according to RFC 7231
 */
export declare function formatRfc7231(dt: Temporal.Instant | Temporal.ZonedDateTime): string;
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