Rationale of this project about doctrine-utcdatetime HOT 2 CLOSED

<?php

/**
 * @ORM\Entity
 */
class User {

   /**
     * The date of registration stored in UTC.
     *
     * @var \DateTime|null
     *
     * @ORM\Column(type="datetime", name="registration_date", nullable=true)
     */
    private $registrationDate;

    /**
     * The timezone of the registration date (eg. Europe/Amsterdam).
     *
     * @var string|null
     *
     * @ORM\Column(type="string", name="registration_date_tz", length=32, nullable=true)
     */
    private $registrationDateTimeZone;

    /**
     * @param \DateTimeInterface $registrationDate
     */
    public function setRegistrationDate(DateTimeInterface $registrationDate): void
    {
        $this->registrationDate = $registrationDate;
        $this->registrationDateTimeZone = $registrationDate->getTimezone()->getName();
    }

    /**
     * @return \DateTime
     */
    public function getRegistrationDate(): ?DateTime
    {
        if ($this->registrationDate === null) {
            return null;
        }

        $tz = new DateTimeZone($this->registrationDateTimeZone);
        return $this->registrationDate->setTimezone($tz);
    }
}