/**
 * Generates timestamp in Memobird API format (YYYY-MM-DD HH:mm:ss)
 *
 * @param date - Date object to format (defaults to current date/time)
 * @returns Formatted timestamp string
 *
 * @example
 * ```typescript
 * const timestamp = generateTimestamp();
 * console.log(timestamp); // '2025-12-29 14:30:45'
 * ```
 */
export declare function generateTimestamp(date?: Date): string;
/**
 * Validates if a string matches Memobird timestamp format
 *
 * @param timestamp - Timestamp string to validate
 * @returns true if valid format, false otherwise
 *
 * @example
 * ```typescript
 * isValidTimestamp('2025-12-29 14:30:45'); // true
 * isValidTimestamp('2025/12/29 14:30:45'); // false
 * ```
 */
export declare function isValidTimestamp(timestamp: string): boolean;
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