How to get Time Zone through IP Address in PHP [duplicate]

I want to get time zone through an IP Address in PHP. Actually, I have an application which will run at the client machine. I have the IP address of the client machine. But I am not able to get the time zone for each client machine.

Solution 1:

$ip = "189.240.194.147";  //$_SERVER['REMOTE_ADDR']
$ipInfo = file_get_contents('http://ip-api.com/json/' . $ip);
$ipInfo = json_decode($ipInfo);
$timezone = $ipInfo->timezone;
date_default_timezone_set($timezone);
echo date_default_timezone_get();
echo date('Y/m/d H:i:s');

Sometime it won't work on local server so try on server.

Edit: This data is coming from ip-api.com, they're free to use as long as you don't exceed 45 requests per minute and not using commercially. See their TOS, not a long a page.

Solution 2:

IP address can't even be relied upon to map to a country; you're treading on thin ice if you also want to get timezone. You're better off to have the client send you the time zone, perhaps in a header.

See Tor: anonymity online for yet another reason to stop using IP addresses for things they were not designed for.

Solution 3:

If you're running it on the local machine, you can check the configured timezone.
http://www.php.net/manual/en/function.date-default-timezone-get.php

There are a lot better and more reliable methods then trying to guess timezone using GeoIP. If you're feeling lucky, try: http://www.php.net/manual/en/book.geoip.php

$region = geoip_region_by_name('www.example.com');
$tz = geoip_time_zone_by_country_and_region($region['country_code'],
                                            $region['region']);  

Solution 4:

There's no absolutely certain way to get the client's timezone, but if you have the client submit the date and time from their machine, you can compute it based on what the time it is relative to GMT. So, if it's 7:00pm on their machine and it's 12:00am GMT, then you can determine they are -5 from GMT or (EST/DST)

Solution 5:

It is not a good idea for searching the timezone of a user through his or her ip address as he can access his or her account from different places at different times. So it is impossible to locate his timezone through ip address. But I have tried to find a solution and i am giving my code here. Any criticism about the coding technique will be highly appreciated.

<?php

$time_zone = getTimeZoneFromIpAddress();
echo 'Your Time Zone is '.$time_zone;

function getTimeZoneFromIpAddress(){
    $clientsIpAddress = get_client_ip();

    $clientInformation = unserialize(file_get_contents('http://www.geoplugin.net/php.gp?ip='.$clientsIpAddress));

    $clientsLatitude = $clientInformation['geoplugin_latitude'];
    $clientsLongitude = $clientInformation['geoplugin_longitude'];
    $clientsCountryCode = $clientInformation['geoplugin_countryCode'];

    $timeZone = get_nearest_timezone($clientsLatitude, $clientsLongitude, $clientsCountryCode) ;

    return $timeZone;

}

function get_client_ip() {
    $ipaddress = '';
    if (getenv('HTTP_CLIENT_IP'))
        $ipaddress = getenv('HTTP_CLIENT_IP');
    else if(getenv('HTTP_X_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
    else if(getenv('HTTP_X_FORWARDED'))
        $ipaddress = getenv('HTTP_X_FORWARDED');
    else if(getenv('HTTP_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_FORWARDED_FOR');
    else if(getenv('HTTP_FORWARDED'))
        $ipaddress = getenv('HTTP_FORWARDED');
    else if(getenv('REMOTE_ADDR'))
        $ipaddress = getenv('REMOTE_ADDR');
    else
        $ipaddress = 'UNKNOWN';
    return $ipaddress;
}

function get_nearest_timezone($cur_lat, $cur_long, $country_code = '') {
    $timezone_ids = ($country_code) ? DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, $country_code)
        : DateTimeZone::listIdentifiers();

    if($timezone_ids && is_array($timezone_ids) && isset($timezone_ids[0])) {

        $time_zone = '';
        $tz_distance = 0;

        //only one identifier?
        if (count($timezone_ids) == 1) {
            $time_zone = $timezone_ids[0];
        } else {

            foreach($timezone_ids as $timezone_id) {
                $timezone = new DateTimeZone($timezone_id);
                $location = $timezone->getLocation();
                $tz_lat   = $location['latitude'];
                $tz_long  = $location['longitude'];

                $theta    = $cur_long - $tz_long;
                $distance = (sin(deg2rad($cur_lat)) * sin(deg2rad($tz_lat)))
                    + (cos(deg2rad($cur_lat)) * cos(deg2rad($tz_lat)) * cos(deg2rad($theta)));
                $distance = acos($distance);
                $distance = abs(rad2deg($distance));
                // echo '<br />'.$timezone_id.' '.$distance;

                if (!$time_zone || $tz_distance > $distance) {
                    $time_zone   = $timezone_id;
                    $tz_distance = $distance;
                }

            }
        }
        return  $time_zone;
    }
    return 'unknown';
}