import dayjs from 'dayjs';
export declare function formatDate(date: dayjs.Dayjs, format?: string): string;
export declare function getFirstDayInMonth(date: string | dayjs.Dayjs): {
    ddd: string;
    basic: string;
    object: dayjs.Dayjs;
};
export declare function getLastDayInMonth(date: string): {
    ddd: string;
    basic: string;
    object: dayjs.Dayjs;
};
export declare function getDaysInMonth(date: string | dayjs.Dayjs): dayjs.Dayjs[];
export declare function getNextMonth(date: dayjs.Dayjs): dayjs.Dayjs;
export declare function getPreviousMonth(date: dayjs.Dayjs): dayjs.Dayjs;
export declare function getNumberOfDay(dayString: string): number;
export declare function getLastDaysInMonth(date: dayjs.Dayjs | string, size?: number): any[];
export declare function getFirstDaysInMonth(date: string | dayjs.Dayjs, size?: number): any[];
export declare function loadDayjsLanguageModule(language?: string): void;
export declare function dateIsValid(date: Date | number): boolean;