/**
 * @fileoverview Shared formatting utilities for tool format() functions.
 * @module mcp-server/tools/format-utils
 */
/**
 * Derive a representative IANA timezone from an NWS zone or county code.
 *
 * @param zoneCode - NWS zone (`WAZ558`) or county code (`WAC033`).
 * @returns The state's primary IANA zone, or `undefined` when the code is
 *   missing, malformed, or its state prefix isn't in the map.
 */
export declare function zoneCodeToTimeZone(zoneCode: string | undefined | null): string | undefined;
/** Convert Celsius to Fahrenheit. */
export declare function cToF(c: number): number;
/** Convert Fahrenheit to Celsius. */
export declare function fToC(f: number): number;
/** Format an ISO 8601 timestamp as a short human-readable string. */
export declare function formatTimestamp(iso: string, timeZone?: string | null): string;
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