/**
 * Return the day (1-31) from a zoned datetime string.
 *
 * - Returns zero-padded string for day.
 * - Returns "" for invalid input.
 *
 * @param value ISO zoned datetime string (e.g., "2024-03-15T14:30:45.123+00:00[UTC]")
 * @returns Day (01-31) or "" on invalid input
 *
 * @example parseDayFromZoned("2024-03-15T14:30:45+00:00[UTC]") // "15"
 * @example parseDayFromZoned("invalid") // ""
 */
export declare function parseDayFromZoned(value: string): string;