export declare class DateBS {
    year: number;
    month: number;
    day: number;
    constructor(year: number, month: number, day: number);
    static fromString(datestring: string): DateBS;
    toString(): string;
    dayOfYear(): number;
    daysInYear(): number;
    static daysInYear(year: number): number;
    daysSince(date?: DateBS): number;
    add(day: number, month?: number, year?: number): DateBS;
    toAD(): Date;
    static fromAD(date?: Date): DateBS;
    static daysDiff(a: any, b: any): number;
    monthsInYear(): any;
    static monthsInYear(year: number): any;
    daysInMonth(): number;
    static daysInMonth(year: number, month: number): number;
}