StatisticEntryBase::parseDateString

static function parseDateString($str)
{
	if($str === '')
	{
		return null;
	}

	try
	{
		$date = new Date($str, Date::convertFormatToPhp(FORMAT_DATE));
	}
	catch(Main\ObjectException $e)
	{
		try
		{
			$date = new DateTime($str, Date::convertFormatToPhp(FORMAT_DATETIME));
			$date->setTime(0, 0, 0);
		}
		catch(Main\ObjectException $e)
		{
			return null;
		}
	}
	return $date;
}