Mysql：如何诊断和纠正错误的时区
在我的服务器中，我从命令行得到以下内容：
]$ date
Fri Sep 16 13:47:02 JST 2011
这是正确的。
在mysql中，我有以下内容：
mysql> select now();
+---------------------+
| now() |
+---------------------+
| 2011-09-16 04:50:21 |
+---------------------+
1 row in set (0.00 sec)
mysql> SELECT @@global.time_zone, @@session.time_zone;
+--------------------+---------------------+
| @@global.time_zone | @@session.time_zone |
+--------------------+---------------------+
| SYSTEM | SYSTEM |
+--------------------+---------------------+
1 row in set (0.00 sec)
那么，它被设置为系统时间，但为什么不显示相同的时间？
In my server, I have the following from the command line:
]$ date
Fri Sep 16 13:47:02 JST 2011
Which is correct.
in mysql, I have the following:
mysql> select now();
+---------------------+
| now() |
+---------------------+
| 2011-09-16 04:50:21 |
+---------------------+
1 row in set (0.00 sec)
mysql> SELECT @@global.time_zone, @@session.time_zone;
+--------------------+---------------------+
| @@global.time_zone | @@session.time_zone |
+--------------------+---------------------+
| SYSTEM | SYSTEM |
+--------------------+---------------------+
1 row in set (0.00 sec)
So, it is set to the system time, but then why is not showing the same time?
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评论（2）
更改系统时区后，只需重新启动mysqld即可。MySQL
的全局时区采用系统时区。当你改变系统的任何此类属性时，你只需要重新启动Mysqld。
就是这样。
You just need to restart mysqld after altering timezone of System..
The Global time zone of MySQL takes timezone of System. When you change any such attribute of system, you just need a restart of Mysqld.
That's it.
您的查询返回 UTC 格式的值，但从命令行输出来看，您的系统采用的是 JST 格式。由于变量返回 SYSTEM，我建议您的配置可能已将系统识别为 UTC。按照此处的建议检查您的 my.cnf 如何我应该让 MySQL 的 NOW() 和 CURDATE() 函数使用 UTC 吗？。
Your queries are returning the values in UTC but from the command line output your system is in JST. Since the variables are returning SYSTEM I would suggest that perhaps your configuration has identified system as UTC. Check out your my.cnf as suggested here How do I make MySQL's NOW() and CURDATE() functions use UTC?.