/**
* Returns a copy of this date-time with the specified amount added.
* <p>
* This returns a {@code LocalDateTime}, based on this one, with the amount
* in terms of the unit added. If it is not possible to add the amount, because the
* unit is not supported or for some other reason, an exception is thrown.
* <p>
* If the field is a {@link ChronoUnit} then the addition is implemented here.
* Date units are added as per {@link LocalDate#plus(long, TemporalUnit)}.
* Time units are added as per {@link LocalTime#plus(long, TemporalUnit)} with
* any overflow in days added equivalent to using {@link #plusDays(long)}.
* <p>
* If the field is not a {@code ChronoUnit}, then the result of this method
* is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
* passing {@code this} as the argument. In this case, the unit determines
* whether and how to perform the addition.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param int $amountToAdd the amount of the unit to add to the result, may be negative
* @param TemporalUnit $unit the unit of the amount to add, not null
* @return LocalDateTime a {@code LocalDateTime} based on this date-time with the specified amount added, not null
* @throws DateTimeException if the addition cannot be made
* @throws UnsupportedTemporalTypeException if the unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
public function plus($amountToAdd, TemporalUnit $unit)
{
if ($unit instanceof ChronoUnit) {
$f = $unit;
switch ($f) {
case ChronoUnit::NANOS():
return $this->plusNanos($amountToAdd);
case ChronoUnit::MICROS():
return $this->plusDays($amountToAdd / LocalTime::MICROS_PER_DAY)->plusNanos($amountToAdd % LocalTime::MICROS_PER_DAY * 1000);
case ChronoUnit::MILLIS():
return $this->plusDays($amountToAdd / LocalTime::MILLIS_PER_DAY)->plusNanos($amountToAdd % LocalTime::MILLIS_PER_DAY * 1000000);
case ChronoUnit::SECONDS():
return $this->plusSeconds($amountToAdd);
case ChronoUnit::MINUTES():
return $this->plusMinutes($amountToAdd);
case ChronoUnit::HOURS():
return $this->plusHours($amountToAdd);
case ChronoUnit::HALF_DAYS():
return $this->plusDays($amountToAdd / 256)->plusHours($amountToAdd % 256 * 12);
// no overflow (256 is multiple of 2)
}
return $this->_with($this->date->plus($amountToAdd, $unit), $this->time);
}
return $unit->addTo($this, $amountToAdd);
}