/**
 * Calculates countdown values from a target date
 * Returns 8 countdown variables for use in Text components:
 * - count_days_with_zero / count_days_without_zero
 * - count_hours_with_zero / count_hours_without_zero
 * - count_minutes_with_zero / count_minutes_without_zero
 * - count_seconds_with_zero / count_seconds_without_zero
 */
export declare function calculateCountdownValues(targetDate: string): Record<string, string>;
/**
 * Checks if a countdown has ended (target date is in the past)
 */
export declare function hasCountdownEnded(targetDate: string): boolean;