/**
 * ISO 8601 timestamp string type.
 *
 * All timestamps at event/API boundaries are ISO strings.
 * Core handlers parse to Date internally when needed.
 *
 * @example "2024-01-15T10:30:00.000Z"
 */
export type ISOTimestamp = string;
/**
 * Convert a Date to ISO timestamp string.
 * Defaults to current time if no date provided.
 */
export declare function toISOTimestamp(date?: Date): ISOTimestamp;
/**
 * Parse an ISO timestamp string to Date.
 */
export declare function parseTimestamp(iso: ISOTimestamp): Date;
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