{
    /**
     * Represents time durations at a given granularity.
     */
    TimeUnit: {
        /**
         * Construct a TimeUnit object.
         * 
         * @param  {number} scale The number of seconds in this unit
         * @return {TimeUnit} A new TimeUnit object
         */
        _new: scale => {
            _scale: scale,
            /**
             * Convert the given value from this unit of time to milliseconds
             */
            toMillis: x => this.toSeconds(x) * 1000,
            /**
             * Convert the given value from this unit of time to seconds
             */
            toSeconds: x => x * this._scale,
            /**
             * Convert the given value from this unit of time to minutes
             */
            toMinutes: x => Math.floor(this.toSeconds(x) / 60),
            /**
             * Convert the given value from this unit of time to hours
             */
            toHours: x => Math.floor(this.toSeconds(x) / (60 * 60)),
            /**
             * Convert the given value from this unit of time to days
             */
            toDays: x => Math.floor(this.toSeconds(x) / (24 * 60 * 60))
        },
        MILLIS: this._new(1 / 1000),
        SECONDS: this._new(1),
        MINUTES: this._new(60),
        HOURS: this._new(60 * 60),
        DAYS: this._new(24 * 60 * 60),
    },

    /**
     * Represents chronological durations at a given granularity.
     */
    ChronoUnit: {
        /**
         * Construct a ChronoUnit object.
         * 
         * @param  {number} scale The number of milliseconds in this unit
         * @return {ChronoUnit} A new ChronoUnit object
         */
        _new: scale => {
            _scale: scale,
            /**
             * Compute the duration between two Dates in this unit of time
             */
            between: (left, right) => Math.floor(Math.abs(left.getTime() - right.getTime()) / this._scale)
        },

        MILLIS: this._new(__root__.TimeUnit.MILLIS.toMillis(1)),
        SECONDS: this._new(__root__.TimeUnit.SECONDS.toMillis(1)),
        MINUTES: this._new(__root__.TimeUnit.MINUTES.toMillis(1)),
        HOURS: this._new(__root__.TimeUnit.HOURS.toMillis(1)),
        DAYS: this._new(__root__.TimeUnit.DAYS.toMillis(1)),
        WEEKS: this._new(__root__.TimeUnit.DAYS.toMillis(7)),
        MONTHS: this._new(__root__.TimeUnit.DAYS.toMillis(30)),
        YEARS: this._new(__root__.TimeUnit.DAYS.toMillis(365)),
    }
}