/**
* Set the value of the "created at" attribute.
*
* @param mixed $value
* @return void
*/
public function setCreatedAt($value)
{
$this->{static::CREATED_AT} = $value;
if (!$value instanceof Carbon) {
$value = new Carbon($value);
}
$this->{static::CREATED_AT . '_gmt'} = $value->timezone('GMT');
}
