public YearWeek minusWeeks(long weeksToSubtract) {
        if (weeksToSubtract == 0) {
            return this;
        }
        LocalDate mondayOfWeek = atDay(DayOfWeek.MONDAY).minusWeeks(weeksToSubtract);
        return YearWeek.from(mondayOfWeek);
    }
public YearWeek minusWeeks ( long weeksToSubtract ) { if ( weeksToSubtract == 0 ) { return this ; } LocalDate mondayOfWeek = atDay ( DayOfWeek . MONDAY ) . minusWeeks ( weeksToSubtract ) ; return YearWeek . from ( mondayOfWeek ) ; }
Returns a copy of this year-week with the specified number of weeks subtracted.
<p>
This instance is immutable and unaffected by this method call.

@param weeksToSubtract  the weeks to subtract, may be negative
@return the year-week with the weeks subtracted, not null