/**
 * Formats ISO timestamps into compact relative labels for discussion UIs.
 */
export declare function formatRelativeTime(value: string | number | Date | null | undefined, options?: {
    emptyValue?: string;
    now?: number;
}): string;
/**
 * Full absolute timestamp for tooltips / accessible labels.
 */
export declare function formatAbsoluteTime(value: string | number | Date | null | undefined, options?: {
    emptyValue?: string;
}): string;