/**
 * Time Utilities
 *
 * Formatting utilities for time display in CLI output.
 */
/**
 * Format ISO timestamp to relative time string
 *
 * Examples:
 * - "just now" (< 1 minute)
 * - "5m ago" (minutes)
 * - "2h ago" (hours)
 * - "3 days ago" (days)
 * - "2 weeks ago" (weeks)
 * - "1 month ago" (months)
 * - "1 year ago" (years)
 *
 * @param isoString ISO 8601 timestamp string
 * @returns Human-readable relative time
 */
export declare function formatRelativeTime(isoString: string): string;
/**
 * Format duration between two timestamps
 *
 * @param startIso Start timestamp (ISO 8601)
 * @param endIso End timestamp (ISO 8601), defaults to now
 * @returns Human-readable duration string
 */
export declare function formatDuration(startIso: string, endIso?: string): string;
/**
 * Format a timestamp for display
 *
 * @param isoString ISO 8601 timestamp string
 * @param format Output format: 'relative', 'short', 'long'
 * @returns Formatted time string
 */
export declare function formatTimestamp(isoString: string, format?: 'relative' | 'short' | 'long'): string;
/**
 * Check if a timestamp is within a given time window
 *
 * @param isoString ISO 8601 timestamp string
 * @param windowMs Time window in milliseconds
 * @returns True if within window
 */
export declare function isWithinTimeWindow(isoString: string, windowMs: number): boolean;
/**
 * Get "time ago" for session display
 * Similar to formatRelativeTime but more compact
 *
 * @param isoString ISO 8601 timestamp string
 * @returns Compact relative time (e.g., "2h 15m ago")
 */
export declare function formatTimeAgo(isoString: string): string;
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