declare global {
    interface Date {
        /**
         * Returns an array of strings representing the days of the specified month and year.
         * Each string in the array has the format "DD-dayName", where "DD" is the day of the month and "dayName" is the name of the day (e.g. "01-Sun").
         */
        getDaysArray(year?: number, month?: number): string[];
        /** Formats a date object as a string in the format "YYYY-MM-DD". */
        formatMMDDYYYY(): string;
        /** Returns the time part of a Date object in the format "HH:MM:SS" or "HH:MM:SS:MS" if addMS is true. */
        formatHHMMSS(addMs?: boolean): string;
        formatMMDDYYYY_HHMMSS(): string;
        /** Returns the Unix timestamp (number of seconds since January 1, 1970) rounded up to the nearest second. */
        unix(): number;
    }
    interface String {
        /** Returns a promise that resolves after a given number of milliseconds. */
        sleep(): Promise<void>;
        /** Converts a Unix timestamp to a date string in the format "MM/DD/YYYY HH:MM:SS". */
        ts2date(): string;
        /** Converts a number of seconds to a human-readable string in the format "X units". */
        sec2read(): string;
    }
    interface Number {
        /** Returns a promise that resolves after a given number of milliseconds. */
        sleep(): Promise<void>;
        /** Converts a Unix timestamp to a date string in the format "MM/DD/YYYY HH:MM:SS". */
        ts2date(): string;
        /** Converts a number of seconds to a human-readable string in the format "X units". */
        sec2read(): string;
    }
}
export {};