/**
 * Get current timestamp as ISO string
 */
export declare function nowISO(): string;
/**
 * Get ISO string for N days ago
 */
export declare function daysAgoISO(days: number): string;
/**
 * Get ISO string for N hours ago
 */
export declare function hoursAgoISO(hours: number): string;
/**
 * Calculate days since a given ISO date string
 */
export declare function daysSince(isoDate: string): number;
/**
 * Calculate hours since a given ISO date string
 */
export declare function hoursSince(isoDate: string): number;
/**
 * Calculate seconds since a given ISO date string
 */
export declare function secondsSince(isoDate: string): number;
/**
 * Check if an ISO date is older than N days
 */
export declare function isOlderThanDays(isoDate: string, days: number): boolean;
/**
 * Check if an ISO date is older than N hours
 */
export declare function isOlderThanHours(isoDate: string, hours: number): boolean;
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