get user timezone

Question

Possible Duplicate    How can I determine a web user  39 s time zone        Which is the best way to do this   php or javascript Can someone provide me with some snippets   thanks

User · Answer

On server-side it will be not as accurate as with JavaScript. Meanwhile, sometimes it is required to solve such task. Just to share the possible solution in this case I write this answer.

If you need to determine user's time zone it could be done via Geo-IP services. Some of them providing timezone. For example, this one (http://smart-ip.net/geoip-api) could help:

<?php
$ip     = $_SERVER['REMOTE_ADDR']; // means we got user's IP address 
$json   = file_get_contents( 'http://smart-ip.net/geoip-json/' . $ip); // this one service we gonna use to obtain timezone by IP
// maybe it's good to add some checks (if/else you've got an answer and if json could be decoded, etc.)
$ipData = json_decode( $json, true);

if ($ipData['timezone']) {
    $tz = new DateTimeZone( $ipData['timezone']);
    $now = new DateTime( 'now', $tz); // DateTime object corellated to user's timezone
} else {
   // we can't determine a timezone - do something else...
}

User · Answer

Just as Oded has answered  You need to have this sort of detection functionality in javascript   I ve struggled with this myself and realized that the offset is not enough  It does not give you any information about daylight saving for example  I ended up writing some code to map to zoneinfo database keys   By checking several dates around a year you can more accurately determine a timezone   Try the script here  http   jsfiddle net pellepim CsNcf   Simply change your system timezone and click run to test it  If you are running chrome you need to do each test in a new tab though  and safar needs to be restarted to pick up timezone changes    If you want more details of the code check out  https   bitbucket org pellepim jstimezonedetect

User · Answer

This will get you the timezone as a PHP variable  I wrote a function using jQuery and PHP   This is tested  and does work  On the PHP page where you are want to have the timezone as a variable  have this snippet of code somewhere near the top of the page   lt  php         session start         timezone     SESSION  time      gt   This will read the session variable  quot time quot   which we are now about to create  On the same page  in the  lt head gt  section  first of all you need to include jQuery   lt script type  quot text javascript quot  src  quot http   code jquery com jquery-latest min js quot  gt  lt  script gt   Also in the  lt head gt  section  paste this jQuery   lt script type  quot text javascript quot  gt        document  ready function             if  quot  lt  php echo  timezone    gt  quot  length  0               var visitortime   new Date                var visitortimezone    quot GMT  quot    -visitortime getTimezoneOffset   60                ajax                   type   quot GET quot                   url   quot http   example com timezone php quot                   data   time    visitortimezone                  success  function                        location reload                                                         lt  script gt   You may or may not have noticed  but you need to change the url to your actual domain  One last thing   You are probably wondering what the heck timezone php is   Well  it is simply this   create a new file called timezone php and point to it with the above url   lt  php     session start          SESSION  time       GET  time      gt   If this works correctly  it will first load the page  execute the JavaScript  and reload the page   You will then be able to read the  timezone variable and use it to your pleasure   It returns the current UTC GMT time zone offset  GMT -7  or whatever timezone you are in  You can read more about this on my blog

[php] get user timezone

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