Method minus

base/src/main/java/net/time4j/PlainTimestamp.java:1354–1361

(
        long amount,
        CalendarUnit unit
    )

     * @since   4.19
     */
    public PlainTimestamp minus(
        long amount,
        CalendarUnit unit
    ) {

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

    }

    /**
     * <p>Subtracts given amount in units from this timestamp and yields the result of subtraction. </p>