export declare class DateHelper {
    static equals(value1?: Date | null, value2?: Date | null): boolean;
    static getDates(start: Date, end: Date): Date[];
    static dateOnly(value: Date): Date;
    static today(): Date;
    static toISODateString(value: Date | string): string | null;
    static toISOTimeString(value: Date | string): string | null;
    static toTimeInput(value: Date | string): string | null;
    private static readonly _utcDiff;
    static utcToLocal(utc: Date): Date;
    static localToUtc(utc: Date): Date;
    static addTime(value: Date, time: string | undefined | null): Date;
    static addYears(v: Date, years: number): Date;
    static addMonths(v: Date, months: number): Date;
    static addDays(v: Date, days: number): Date;
    static addHours(v: Date, hours: number): Date;
    static addMinutes(v: Date, minutes: number): Date;
    static addSeconds(v: Date, seconds: number): Date;
    static isToday(date: Date): boolean;
    static clone(date: Date): Date;
    static isAnotherMonth(a: Date, b: Date): boolean;
    static isWeekend(v: Date): boolean;
    static isSameDate(a: Date, b: Date): boolean;
    static getAge(value?: Date | string | null, now?: Date | null): number | null;
    static subtractMonths(endDate: Date, starDate: Date): number;
    static subtractDays(value: Date, date: Date): number | null;
    static subtractHours(value: Date, date?: Date | null): number | null;
    static subtractMinutes(value: Date, date?: Date | null): number | null;
    static ISO8601_DATE_REGEX: RegExp;
    static parseDate(value: any): Date | null;
    /***
     * Converts a value to date.
     *
     * Supported input formats:
     * - `Date`
     * - number: timestamp
     * - string: numeric (e.g. "1234"), ISO and date strings in a format supported by
     *   [Date.parse()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse).
     *   Note: ISO strings without time return a date without timeoffset.
     *
     * Throws if unable to convert to a date.
     */
    static toDate(value: string | number | Date): Date;
    /**
     * Converts a date in ISO8601 to a Date.
     * Used instead of `Date.parse` because of browser discrepancies.
     */
    static isoStringToDate(match: RegExpMatchArray): Date;
    static isDate(value: any): value is Date;
}