/**
 * Return the month (1-12) for a given ISO 8601 datetime string.
 *
 * - Returns zero-padded string for month.
 * - Returns "" for invalid input.
 *
 * @param value ISO datetime string
 * @returns Month (01-12) or "" on invalid input
 *
 * @example parseMonthFromDateTime("2024-03-15T12:30:00") // "03"
 * @example parseMonthFromDateTime("invalid") // ""
 */
export declare function parseMonthFromDateTime(value: string): string;