import { _PdfAbstractSyntaxElement } from '../asn1/abstract-syntax';
/**
 * Helper representing ASN.1 Time types (UTCTime/GeneralizedTime) and conversion utilities.
 *
 * @private
 */
export declare class _PdfX509Time {
    private _time;
    constructor(time: _PdfAbstractSyntaxElement);
    /**
     * Extract a trimmed universal time string from the ASN.1 time element.
     *
     * @private
     * @returns {string} RFC-style time string or undefined when unavailable.
     */
    _getUniversalTime(): string;
    /**
     * Convert the ASN.1 time element into a JavaScript `Date` object (UTC).
     *
     * @private
     * @returns {Date} Parsed Date object or undefined if parsing fails.
     */
    _toDate(): Date;
}