Set timezone in PHP

Here is a example how you can set time zone in php.Time zone functionally is very important in auction sites, freelance based sites, product base sites, but many programmer don’t care about time zone.
due to this lake of programming visitor face problems and sites goes to down.
Here is an example how we can solve time zone issue according to
PHP script. 

date_default_timezone_set(‘America/Los_Angeles’);
// Asia/Calcutta
$format = ‘Y-m-d H:i:s A’
echo date($format);