/**
 * Parse a time string, which can be either an ISO date or a relative time like -30m, -1h, -1d
 * @param timeStr Time string to parse
 * @returns Timestamp in milliseconds
 */
export declare function parseTimeString(timeStr?: string): number | undefined;
/**
 * Get a date from a timestamp
 * @param timestamp Timestamp in milliseconds
 * @returns Date object
 */
export declare function getDateFromTimestamp(timestamp?: number): Date | undefined;
/**
 * Format a timestamp as ISO string
 * @param timestamp Timestamp in milliseconds
 * @returns ISO string or undefined
 */
export declare function formatTimestamp(timestamp?: number): string | undefined;
/**
 * Get a default time range
 * @param defaultMinutesAgo Default minutes to go back
 * @returns Object with start and end timestamps
 */
export declare function getDefaultTimeRange(defaultMinutesAgo?: number): {
    startTime: number;
    endTime?: number;
};