public function test_factory_from_TemporalAmount_null()
{
TestHelper::assertNullException($this, function () {
Period::from(null);
});
}
/**
* Returns a copy of this period with the specified period subtracted.
* <p>
* This operates separately on the years, months and days.
* No normalization is performed.
* <p>
* For example, "1 year, 6 months and 3 days" minus "2 years, 2 months and 2 days"
* returns "-1 years, 4 months and 1 day".
* <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 TemporalAmount $amountToSubtract the amount to subtract, not null
* @return Period a {@code Period} based on this period with the requested period subtracted, not null
* @throws DateTimeException if the specified amount has a non-ISO chronology or
* contains an invalid unit
* @throws ArithmeticException if numeric overflow occurs
*/
public function minusAmount(TemporalAmount $amountToSubtract)
{
$isoAmount = Period::from($amountToSubtract);
return $this->create(Math::subtractExact($this->years, $isoAmount->years), Math::subtractExact($this->months, $isoAmount->months), Math::subtractExact($this->days, $isoAmount->days));
}
