/**
 * Retrieves the ERP timezone name that should have been cached during initialization.
 * @throws Error when the timezone cache has not been populated.
 */
export declare function getERPTimezone(): string;
/**
 * Converts a UTC ISO-8601 datetime string to the ERP's local timezone (also ISO-8601).
 * @param utcDateTime ISO-8601 datetime string representing UTC time.
 * @param timezone Optional timezone override; defaults to the cached ERP timezone.
 * @returns ISO-8601 string in the ERP timezone.
 */
export declare function convertUtcDateTimeToErpLocal(utcDateTime: string, timezone?: string): string;
/**
 * Converts an ERP-local ISO-8601 datetime string to UTC (still ISO-8601).
 * @param localDateTime ISO-8601 datetime string representing ERP local time.
 * @param timezone Optional timezone override; defaults to the cached ERP timezone.
 * @returns ISO-8601 string in UTC.
 */
export declare function convertErpLocalDateTimeToUtc(localDateTime: string, timezone?: string): string;
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