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@ 2017-07-12T09:41:06Z

<?php

class ContractVersion
{
    private $end_date;

    public function __construct(\DateTime $end_date)
    {
        $this->end_date = $end_date;
    }

    public function getEndDate(): \DateTime
    {
        return clone $this->end_date;
    }
}

class VersionedContract
{
    private $versions = [];

    public function __construct(\DateTime $end_date)
    {
        $this->versions[] = new ContractVersion($end_date);
    }

    public function getEndDate(): \DateTime
    {
        return $this->getCurrentVersion()->getEndDate();
    }

    private function getCurrentVersion(): ContractVersion
    {
        return end($this->versions);
    }

    public function renew(\DateInterval $interval)
    {
        $this->versions[] = new ContractVersion($this->getEndDate()->add($interval));
    }
}

$contract = new VersionedContract(new \DateTime('2017-10-10 10:10:00'));

var_dump($contract->getEndDate()); // string(26) "2017-10-10 10:10:00.000000"
$endDate = $contract->getEndDate();

var_dump($endDate); // same string(26) "2017-10-10 10:10:00.000000"

$endDate->add(new \DateInterval('P1Y'));

var_dump($endDate);

Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.21, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7: object(DateTime)#4 (3) { ["date"]=> string(26) "2017-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#4 (3) { ["date"]=> string(26) "2017-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#4 (3) { ["date"]=> string(26) "2018-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13: object(DateTime)#4 (3) { ["date"]=> string(26) "2017-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#4 (3) { ["date"]=> string(26) "2017-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } object(DateTime)#4 (3) { ["date"]=> string(26) "2018-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

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