Returns a copy of this {@code YearMonth} with the specified number of years subtracted.
!(p)
This instance is immutable and unaffected by this method call.
@param yearsToSubtract the years to subtract, may be negative
@return a {@code YearMonth} based on this year-month with the years subtracted, not null
@throws DateTimeException if the result exceeds the supported range
Returns a copy of this {@code YearMonth} with the specified number of years subtracted. !(p) This instance is immutable and unaffected by this method call.
@param yearsToSubtract the years to subtract, may be negative @return a {@code YearMonth} based on this year-month with the years subtracted, not null @throws DateTimeException if the result exceeds the supported range