Method minus

base/src/main/java/net/time4j/engine/TimePoint.java:312–322

(TimeSpan<? extends U> timeSpan)

     * @see     #plus(TimeSpan)
     */
    public T minus(TimeSpan<? extends U> timeSpan) {

        try {
            return timeSpan.subtractFrom(this.getContext());
        } catch (IllegalArgumentException iae) {
            ArithmeticException ex = new ArithmeticException("Result beyond boundaries of time axis.");
            ex.initCause(iae);
            throw ex;
        }

    }

    /**
     * <p>Adds given amount in units to this time point and yields the