I have changed my joomla and wordpress files from old server to new server. In the front end and admin side its working without any errors. But in the Database (phpmyadmin)
The best way is setting a default Time Zone. In config.inc.php file, insert one line with:
date_default_timezone_set('America/Sao_Paulo');
In my case I use "America/Sao_Paulo" in your case I think is "Asia/Calcutta"
For more details about Time Zones, visit http://php.net/manual/en/function.date-default-timezone-set.php