[fw-general] Getting the timezone from the browser's offset

[Peter Wansch]

Hi,
In our application, we let users select Timezones. To render a timezone list
we use the following view helper which works great:

class Ggv_View_Helper_TimezonesList extends Zend_View_Helper_Abstract
{
    public function timezonesList($selectedzone, $label, $name = 'timezone',
$desc = '')
    {
        //$output = '<div class="label"><label for="' . $name .
'">'.$label.':</label></div>';
        $output = '<div class="input"><select name="' . $name . '">';
        $output .= $this->timezonechoice($selectedzone);
        $output .= '</select>';
        $output .= ' '.$desc.' </div>';
        return $output;         
    }
    
    protected function timezonechoice($selectedzone) 
    {
        $all = timezone_identifiers_list();

        $i = 0;
        foreach($all as $zone) 
        {
            $zone = explode('/', $zone);
            $zones[$i]['continent'] = isset($zone[0]) ? $zone[0] : '';
            $zones[$i]['city'] = isset($zone[1]) ? $zone[1] : '';
            $zones[$i]['subcity'] = isset($zone[2]) ? $zone[2] : '';
            $i++;
        }

        asort($zones);
        $structure = '';
        foreach($zones as $zone) 
        {
            extract($zone);
            if($continent == 'Africa' || $continent == 'America' ||
$continent == 'Antarctica' || $continent == 'Arctic' || $continent == 'Asia'
|| $continent == 'Atlantic' || $continent == 'Australia' || $continent ==
'Europe' || $continent == 'Indian' || $continent == 'Pacific') 
            {
                if(!isset($selectcontinent)) 
                {
                    $structure .= '<optgroup label="' . $continent . '">';
// continent
                } 
                elseif($selectcontinent != $continent) 
                {
                    $structure .= '</optgroup><optgroup label="' .
$continent . '">'; // continent
                }

                if(isset($city) != '')
                {
                    if (!empty($subcity) != '')
                    {
                        $city = $city . '/' . $subcity;
                    }
                    $structure .= "<option " . ((($continent . '/' . $city)
== $selectedzone) ? 'selected="selected "' : '')." value=\"" . ($continent .
'/' . $city) . "\">" . str_replace('_', ' ', $city) . "</option>"; //
timezone
                } 
                else 
                {
                    if (!empty($subcity) != '')
                    {
                        $city = $city . '/'. $subcity;
                    }
                    $structure .= "<option " . (($continent ==
$selectedzone) ? 'selected="selected "' : '') . " value=\"" . $continent .
"\">" . $continent . "</option>"; // timezone
                }

                $selectcontinent = $continent;
            }
        }
        $structure .= '</optgroup>';
        return $structure;
    }
}


In the phtml view script we use the following which also works nicely:

<dt><label for="user_join_communityTimeZone"><?= $this->translate('Community
Time Zone:') ?></label></dt>


In our controller, we set the user_join_communityTimezZone to:

date_default_timezone_get());

so the default is the system timezone.

Is there an (easy way) without figuring out myself from the offset header to
detect the most likely user timezone to avoid user error?
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