Warning: date(): Invalid date.timezone value 'undefined', we selected the timezone 'UTC' for now. in /home/matemo/public_html/index.php on line 2

Warning: date(): Invalid date.timezone value 'undefined', we selected the timezone 'UTC' for now. in /home/matemo/public_html/index.php on line 2
Error: Failed to start application: Failed to start the session because headers have already been sent by "/home/matemo/public_html/index.php" at line 2.