export declare function isLeapYear(year: number): boolean;
export declare function getDaysInMonth(year: number, month: number): 29 | 28 | 30 | 31;
export declare function getDayOnFirstOfMonth(year: number, month: number): number;
export declare function getDaysInDate(date: Date): number;
export declare function toDateNumber(date: Date): number;
export declare function toDateString(date: Date): string;
export declare function toMonthNumber(date: Date): number;
export declare function getPadStartDays(year: number, month: number, amount: number): Date[];
export declare function getPadEndDays(year: number, month: number, amount: number): Date[];
export declare function getOffsetDaysFromFirstDay(weekOnFirstDay: number, weekStartsOn: number): number;
export declare function formatDate(date: Date, formatStr?: string): string;
export declare function minmaxDate(date: Date, minDate: Date, maxDate: Date): Date;
export declare function getPrevMonthDate(date: Date): Date;
export declare function getNextMonthDate(date: Date): Date;