import { TDate } from './timeago/timeago';
export declare type FirstDayOfWeek = '一' | '日';
export declare class DateTimeHelperService {
    private $D;
    constructor();
    relativeTime(date: TDate, locale?: 'en' | 'zh-CHS' | 'zh-CHT'): string;
    addDays(date: Date, days: number): Date;
    subDays(date: Date, days: number): Date;
    differenceInMinutes(dateLeft: Date | number, dateRight: Date | number): number;
    /**
     * @param value 要转换格式的日期
     * @param fmt 格式化字符串
     *
     * 更多的格式化请参考
     * [点我点我](https://date-fns.org/v1.30.1/docs/format)
     */
    formatTo(value: any, fmt?: string): string;
    private createDate;
    private formatDate;
    private setDate;
    private getDateByDate;
    getWeekDate({ baselineDate, range, step }: {
        baselineDate?: Date;
        range?: number;
        step?: number;
    }, firstDayOfWeek?: FirstDayOfWeek): any[];
    /** 根据当前日期，获取当前是所在年的第几周 */
    getYearWeek(year: any, month: any, day: any): number;
    getMonthWeek(year: any, month: any, day: any): {
        getMonth: number;
        getYear: number;
        getWeek: number;
    };
    getNowWeekTime(date: Date, firstDayOfWeek: FirstDayOfWeek): {
        begin: {
            year: number;
            month: number;
            day: number;
        };
        end: {
            year: number;
            month: number;
            day: number;
        };
    };
}