import moment from 'moment';
declare const _default: {
    getStartTime(date: moment.MomentInput): string;
    getEndTime(date: moment.MomentInput): string;
    getMonthFirstDay(d: moment.MomentInput): string;
    timeToUtc(time: moment.Moment | string): string | null;
    toTime(utcTimeStr: string, defaultTime?: string): string;
    utcToMinute(utcTimeStr: string, defaultTime?: string): string;
    toDate(utcTimeStr: string, defaultTime?: string): string;
    formatTimeRange(timeRange: Array<moment.Moment | string>): (string | null)[];
    durationBySecond(seconds: number | string): string;
};
export default _default;