/**
* Get cached time expression parser instance. Instance is shared across all models.
*/
public function getTimeExpressionParser()
{
if (!BundlableLabelableBaseModelWithAttributes::$s_tep) {
BundlableLabelableBaseModelWithAttributes::$s_tep = new TimeExpressionParser();
}
return BundlableLabelableBaseModelWithAttributes::$s_tep;
}