/**
* Returns a copy of this date-time with the specified amount added.
* <p>
* This returns a {@code ZonedDateTime}, based on this one, with the specified amount added.
* The amount is typically {@link Period} or {@link Duration} but may be
* any other type implementing the {@link TemporalAmount} interface.
* <p>
* The calculation is delegated to the amount object by calling
* {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
* to implement the addition in any way it wishes, however it typically
* calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
* of the amount implementation to determine if it can be successfully added.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param TemporalAmount $amountToAdd the amount to add, not null
* @return ZonedDateTime a {@code ZonedDateTime} based on this date-time with the addition made, not null
* @throws DateTimeException if the addition cannot be made
* @throws ArithmeticException if numeric overflow occurs
*/
public function plusAmount(TemporalAmount $amountToAdd)
{
if ($amountToAdd instanceof Period) {
$periodToAdd = $amountToAdd;
return $this->resolveLocal($this->dateTime->plusAmount($periodToAdd));
}
return $amountToAdd->addTo($this);
}
