Returns a copy of this period with the specified period added.
!(p)
This operates separately on the years, months and days.
No normalization is performed.
!(p)
For example, "1 year, 6 months and 3 days" plus "2 years, 2 months and 2 days"
returns "3 years, 8 months and 5 days".
!(p)
The specified amount is typically an instance of {@code Period}.
Other types are interpreted using {@link Period#from(TemporalAmount)}.
!(p)
This instance is immutable and unaffected by this method call.
@param amountToAdd the amount to add, not null
@return a {@code Period} based on this period with the requested period added, not null
@throws DateTimeException if the specified amount has a non-ISO chronology or
contains an invalid unit
@throws ArithmeticException if numeric overflow occurs
Returns a copy of this period with the specified period added. !(p) This operates separately on the years, months and days. No normalization is performed. !(p) For example, "1 year, 6 months and 3 days" plus "2 years, 2 months and 2 days" returns "3 years, 8 months and 5 days". !(p) The specified amount is typically an instance of {@code Period}. Other types are interpreted using {@link Period#from(TemporalAmount)}. !(p) This instance is immutable and unaffected by this method call.
@param amountToAdd the amount to add, not null @return a {@code Period} based on this period with the requested period added, not null @throws DateTimeException if the specified amount has a non-ISO chronology or contains an invalid unit @throws ArithmeticException if numeric overflow occurs