/**
* @return null|int
*/
public function ToDatabase()
{
if ($this->interval != null && !$this->interval->IsNull()) {
return $this->interval->TotalSeconds();
}
return null;
}
/**
* @param DateDiff $difference
* @return Date
*/
public function ApplyDifference(DateDiff $difference)
{
if ($difference->IsNull()) {
return $this->Copy();
}
$newTimestamp = $this->Timestamp() + $difference->TotalSeconds();
$dateStr = gmdate(self::SHORT_FORMAT, $newTimestamp);
$date = new DateTime($dateStr, new DateTimeZone('UTC'));
$date->setTimezone(new DateTimeZone($this->Timezone()));
return new Date($date->format(self::SHORT_FORMAT), $this->Timezone());
}
