src/Norm/Type/NDateTime.php
public function tzFormat($format, $tz = null)
    {
        if (isset($tz)) {
            $this->setTimezone(new DateTimeZone($tz));
        }

        return $this->format($format);
    }
public function tzFormat($format, $tz = null)
    {
        if (isset($tz)) {
            $this->setTimezone(new DateTimeZone($tz));
        }

        return $this->format($format);
    }
public function tzFormat ( $ format , $ tz = null ) { if ( isset ( $ tz ) ) { $ this -> setTimezone ( new DateTimeZone ( $ tz ) ) ; } return $ this -> format ( $ format ) ; }
Formatting by timezone

@param string $format
@param string $tz

@return mixed
Formatting by timezone