export declare function getDayStart(year: number, month: number, day: number): Date;
export declare function getDayEnd(year: number, month: number, day: number): Date;
export declare function getMonthStart(year: number, month: number): Date;
export declare function getMonthEnd(year: number, month: number): Date;
export declare function getYearStart(year: number): Date;
export declare function getYearEnd(year: number): Date;