models/common/Define/Model/DateTime.php

<?php
namespace ProVM\Common\Define\Model;

use Carbon\Carbon;

trait DateTime {
  public function dateTime(\DateTime $date_time = null) {
    if ($date_time === null) {
      return Carbon::parse($this->date_time);
    }
    $this->date_time = $date_time->format('c');
  }
}