date_default_timezone_set()设置时区

You can have time zone set for India as 'Asia/Kolkata' this will add +5.30 to GMT time.

You will get proper time of your time zone.

Example:

<?php
$timezone = "Asia/Calcutta";
if(function_exists('date_default_timezone_set')) date_default_timezone_set($timezone);
echo date('d-m-Y H:i:s');
?>

You will get result as India time

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Even though php supports 'Asia/Riyadh', MySQL doesn't! I had to use '+3:00' instead, to over come that since it's pointless to set the time zone for the script and not the database activities. To do it for both, do the following :

<?php
$timezone = "Asia/Riyadh";
if(function_exists('date_default_timezone_set')) date_default_timezone_set($timezone);

mysql_query("SET SESSION time_zone = '+3:00'");
?>