final public function onTimeZone(string $timeZoneCode): self
    {
        if (\in_array($timeZoneCode, \timezone_identifiers_list())) {
            $this->requestHeaderTimezoneCode = $timeZoneCode;
        }

        return $this;
    }
final public function onTimeZone(string $timeZoneCode): self
    {
        if (\in_array($timeZoneCode, \timezone_identifiers_list())) {
            $this->requestHeaderTimezoneCode = $timeZoneCode;
        }

        return $this;
    }
final public function onTimeZone ( string $ timeZoneCode ) : self { if ( \ in_array ( $ timeZoneCode , \ timezone_identifiers_list ( ) ) ) { $ this -> requestHeaderTimezoneCode = $ timeZoneCode ; } return $ this ; }
Set timezone code.

@param string $timeZoneCode

@return $this
Set timezone code .