/**
 * Timezone Display Formatting Service
 *
 * Converts UTC timestamps to user's local timezone for display.
 * Storage timestamps remain UTC — this is display-layer only.
 *
 * Config chain: .gitmem/config.json → TZ env var → UTC (default)
 */
import type { ThreadObject } from "../types/index.js";
/** Get the configured timezone. Loads once from config chain. */
export declare function getTimezone(): string;
/**
 * Format a date-only string (YYYY-MM-DD) for display.
 *
 * When timezone is UTC (default): returns original string unchanged.
 * When timezone configured: returns "Feb 9, 2026" format.
 *
 * Does NOT shift the date to another timezone — the input is
 * treated as a calendar date, not a UTC midnight timestamp.
 */
export declare function formatDate(dateStr: string): string;
/**
 * Format a full ISO timestamp for display.
 *
 * When timezone is UTC (default): returns original string unchanged.
 * When timezone configured: returns "Feb 9, 2026, 1:45 PM EST" format.
 */
export declare function formatTimestamp(isoStr: string): string;
/**
 * Format a ThreadObject's timestamps for display.
 * Returns original reference when UTC (no allocation).
 * Returns a shallow copy with formatted dates when timezone configured.
 */
export declare function formatThreadForDisplay(thread: ThreadObject): ThreadObject;
/** Reset cached timezone (for testing). */
export declare function resetTimezone(): void;
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