default timezone error in php

Question

I got the following error/warning while tring to install Kohana/SilverStripe.
What does it mean and What do I do for it?

Warning:
date_default_timezone_get():
It is not safe to rely on the system's timezone settings.
You are *required* to use the date.timezone setting or the date_default_timezone_set() function.
In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier.
We selected 'Asia/Calcutta' for '5.5/no DST' instead in C:\Server\apache\htdocs\kohana\system\core\Kohana.php on line 136

Thanks in Advance!

Answer 1

This is not an error, but a warning, so it does not block your app from working.

Explicitly set the right timezone using date_default_timezone_set() in C:\Server\apache\htdocs\kohana\system\core\Kohana.php on line 136

You have to choose among valid timezones