export declare function _localStartOfDate(y: number, m: number, d: number | undefined): number;
export declare function _utcStartOfDate(y: number, m: number, d: number | undefined): number;
export declare function _weekDayNumber(date: Date, day: number): number;
export declare function _getWeekStartByDate(date: Date): Date;
export declare function _getDateFromDay(dayDate: Date, day: number): Date;