Returns a copy of this duration with the length negated.
!(p)
This method swaps the sign of the total length of this duration.
For example, {@code PT1.3S} will be returned as {@code PT-1.3S}.
!(p)
This instance is immutable and unaffected by this method call.
@return a {@code Duration} based on this duration with the amount negated, not null
@throws ArithmeticException if numeric overflow occurs
Returns a copy of this duration with the length negated. !(p) This method swaps the sign of the total length of this duration. For example, {@code PT1.3S} will be returned as {@code PT-1.3S}. !(p) This instance is immutable and unaffected by this method call.
@return a {@code Duration} based on this duration with the amount negated, not null @throws ArithmeticException if numeric overflow occurs