import type { Message } from '../types/schemas/chat/conversations.js';
export declare function formatMessageSeparatorTimestamp(value: Date | string, now?: Date): string;
export declare function formatMessageMenuTimestamp(value: Date | string, now?: Date): string;
export declare function shouldShowTimestampSeparator(value: Date | string, previousValue: Date | string | null): boolean;
export declare function getTimestampSeparatorLabels(messages: readonly Pick<Message, 'id' | 'role' | 'createdAt'>[], now?: Date): Map<string, string>;