使用编码点火器发送邮件的日期错误

A PHP Error was encountered
Severity: Warning
Message: 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 'Europe/Berlin' for 'CET/1.0/no DST' instead
Filename: libraries/Email.php
Line Number: 704
Line Number 709

尝试使用代码点火器发送电子邮件 电子邮件库 我收到此错误。我想我应该指定date_default_timezone_set但我不知道我必须在哪里指定它，因为我在发送邮件时不使用日期。