export declare const DEFAULT_DateTimeFormatSeconds = "YYYY/MM/DD HH:mm:ss";
export declare const DEFAULT_DateTimeFormatWithMillis = "YYYY/MM/DD HH:mm:ss.SSS";
export declare class DateHelper {
    /**
     * Adds (or subtracts if millisToAdd is negative) any number of seconds to a Date.
     * If no Date is provided, the current Date now is used.
     * @param millisToAdd The number of milliseconds to add to the optional Date passed in.
     * @param date Optional Date. Will use new Date() if none passed in. If a number is provided, it is assumed to be in Date epoch milliseconds.
     * @returns A new Date object with the number of seconds added.
     */
    static addMillisToDate(millisToAdd: number, date?: Date | number | string): Date;
    /**
     * Adds (or subtracts if secondsToAdd is negative) any number of seconds to a Date.
     * If no Date is provided, the current Date now is used.
     * @param millisToAdd The number of seconds to add to the optional Date passed in.
     * @param date Optional Date. Will use new Date() if none passed in.
     * @returns A new Date object with the number of seconds added.
     */
    static addSecondsToDate(secondsToAdd: number, date?: Date | number | string): Date;
    /**
     * Adds (or subtracts if minutesToAdd is negative) any number of minutes to a Date.
     * If no Date is provided, the current Date now is used.
     * @param minutesToAdd The number of minutes to add to the optional Date passed in.
     * @param date Optional Date. Will use new Date() if none passed in.
     * @returns A new Date object with the number of minutes added.
     */
    static addMinutesToDate(minutesToAdd: number, date?: Date | number | string): Date;
    /**
     * Adds (or subtracts if hoursToAdd is negative) any number of hours to a Date.
     * If no Date is provided, the current Date now is used.
     * @param hoursToAdd The number of hours to add to the optional Date passed in.
     * @param date Optional Date. Will use new Date() if none passed in.
     * @returns A new Date object with the number of hours added.
     */
    static addHoursToDate(hoursToAdd: number, date?: Date | number | string): Date;
    /**
     * Adds (or subtracts if daysToAdd is negative) any number of days to a Date.
     * If no Date is provided, the current Date now is used.
     * @param daysToAdd The number of days to add to the optional Date passed in.
     * @param date Optional Date. Will use new Date() if none passed in.
     * @returns A new Date object with the number of days added.
     */
    static addDaysToDate(daysToAdd: number, date?: Date | number | string): Date;
    static FormatDateTime(format?: string, dateToFormat?: Date | number | string): string;
    static FormatDateTimeWithMillis(dateToFormat?: Date | number | string): string;
    /**
     * Converts a Date object to a string in ISO format.
     * If there is no date provided, undefined is returned.
     * @param date Any format of date that can be converted to a Date object.
     * @returns A string in ISO format if a Date object is provided, otherwise undefined.
     */
    static toIsoString(date?: Date | number | string): string | undefined;
    /**
     * Converts a Date object to a string in ISO format.
     * If there is no date provided, an empty string is returned.
     * @param date Any format of date that can be converted to a Date object.
     * @returns A string in ISO format if a Date object is provided, otherwise an empty string.
     */
    static toIsoStringSafe(date?: Date | number | string): string;
}
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