Method minus

base/src/main/java/net/time4j/MachineTime.java:697–704

(
        long amount,
        U unit
    )

     * @since   2.0
     */
    public MachineTime<U> minus(
        long amount,
        U unit
    ) {

        return this.plus(Math.negateExact(amount), unit);

    }

    /**
     * <p>Subtracts given temporal amount from this machine time. </p>