timezone settings on compile process

[ghost]

i was trying to build the project but i got this

Failed to compile phar: [Exception] DateTime::__construct(): 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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. at /path/to/cloned/repos/virtphp/src/Virtphp/Compiler.php:58%

the output of the $process->getOutput(); is 2015-05-07 08:29:54 -0300