可能重复：
PHP - 依赖系统的时区设置是不安全的
我在 symfony 1.4/propel 1.4 中有一个现有项目。它在生产服务器（RedHat）和我的本地开发环境（Windows 7 上的 WAMP 服务器）上运行良好。
我正在设置一个新的扩展服务器，在 OpenSuse 12.1 上运行，用于通过 Intranet 进行本地办公室测试。
一切都很好，但我在 HTML 页面上收到以下警告
Warning: date() [function.date]: 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 'IST/5.0/no DST' instead in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/config/sfRootConfigHandler.class.php on line 91
Warning: date() [function.date]: 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 'IST/5.0/no DST' instead in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/config/sfDefineEnvironmentConfigHandler.class.php on line 66
Warning: date() [function.date]: 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 'IST/5.0/no DST' instead in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/config/sfDefineEnvironmentConfigHandler.class.php on line 66
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/config/sfRootConfigHandler.class.php:91) in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/storage/sfSessionStorage.class.php on line 93
Warning: session_regenerate_id() [function.session-regenerate-id]: Cannot regenerate session id - headers already sent in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/storage/sfSessionStorage.class.php on line 171
Warning: Cannot modify header information - headers already sent by (output started at /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/config/sfRootConfigHandler.class.php:91) in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/response/sfWebResponse.class.php on line 336
Warning: Cannot modify header information - headers already sent by (output started at /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/config/sfRootConfigHandler.class.php:91) in /home/admin/svntestco/troupasvn/trunk/lib/vendor/symfony/lib/response/sfWebResponse.class.php on line 357
我知道问题出在某些时区设置上，但我不知道如何解决。我试图找出正在使用的 php.ini 文件，但无法通过 Yast 安装 php。有人可以提供文件名（可能是 php.ini）、它在 opensuse 上的位置以及修复该问题所需的更改。
请注意，我们使用的是 nginx，而不是 apache。