code: public LocalDateTime minusWeeks(long weeks) {
          return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
      }
docs: Returns a copy of this {@code LocalDateTime} with the specified number of weeks subtracted.
  <p>
  This method subtracts the specified amount in weeks from the days field decrementing
  the month and year fields as necessary to ensure the result remains valid.
  The result is only invalid if the maximum/minimum year is exceeded.
  <p>
  For example, 2009-01-07 minus one week would result in 2008-12-31.
  <p>
  This instance is immutable and unaffected by this method call.
  
  @param weeks  the weeks to subtract, may be negative
  @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null
  @throws DateTimeException if the result exceeds the supported date range