export declare class DateParts {
    static YEAR: string;
    static MONTH: string;
    static DAY: string;
    static HOUR: string;
    static MINUTE: string;
    static SECOND: string;
    static TIMESTAMP: string;
}
export declare class DateIntervals {
    static DAY: string;
    static HOUR: string;
    static MINUTES: string;
    static SECONDS: string;
    static isValid(interval: string): boolean;
}