On all our servers, default time zone is Sri Lanka ( GMT + 5.30), However depend on the customizations you will see some diffrent time zones in your account. You can change the PHP time zone in your account by doing following changes.

Step 1 :

Log-in to the cPanel and navigate to file manager, Public_html folder

Step 2:

If there is php.ini file, open it using a text editor in file manager.

    ** If there is no any php.ini file, you can create a new file and name it as php.ini

Step 3:

Add following line on top the php.ini file

date.timezone = "Asia/Colombo"

Step 4:

If you need to use some other time zone, you can replace it with valid time zone from here.

Once you save the file, it will reflect in your web site.