import { DateStringRuleChecker } from './date-string-rule-checker';
import { GuardResult } from '../../core/guard-result';
/**
 * RFC3339 Datetime pattern.
 */
export declare const RFC3339_PATTERN = "^([0-9]{4})-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])([Tt]|\\s)([01][0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9]|60)(.[0-9]+)?(([Zz])|([+|-]([01][0-9]|2[0-3]):[0-5][0-9]))$";
export declare class DateStringIsRfc3339 extends DateStringRuleChecker<{
    type: 'isRfc3339';
}> {
    constructor(rule: {
        type: 'isRfc3339';
    }, value: string);
    /**
     * @override
     */
    exec(): GuardResult;
    private isRfc3339Valid;
    private isRfc3339;
}