export declare namespace DateTime {
    const DateTimeFormatCharacter: {
        Year: string;
        Month: string;
        Day: string;
    };
    function copyDate(src: Date, dest: Date): void;
    function copyTime(src: Date, dest: Date): void;
    function isEqual(d1: Date, d2: Date): boolean;
    function isEqualDates(d1: Date, d2: Date): boolean;
    function isEqualTimes(d1: Date, d2: Date): boolean;
    function compareDateTimes(d1: Date, d2: Date): 1 | 0 | -1;
    function compareDates(d1: Date, d2: Date): 1 | 0 | -1;
    function compareTimes(d1: Date, d2: Date): 1 | 0 | -1;
    function getDateOnly(date: Date): Date;
    function getTimeOnly(date: Date, includeSeconds?: boolean, includeMilliseconds?: boolean): Date;
    function getLastDayOfMonth(year: number, month: number): Date;
    function getLastDayOfPreviousMonth(year: number, month: number): Date;
    function getFirstDayOfNextMonth(year: number, month: number): Date;
    function getLocaleDateStringFormat(localeId: any): string;
}