有人知道MySQL中有没有这样的函数吗?
更新
这不会输出任何有效的信息:
mysql> SELECT @@global.time_zone, @@session.time_zone;
+--------------------+---------------------+
| @@global.time_zone | @@session.time_zone |
+--------------------+---------------------+
| SYSTEM | SYSTEM |
+--------------------+---------------------+
或者MySQL本身不能确切地知道所使用的time_zone，这很好，我们可以在这里涉及PHP，只要我能得到有效的信息，而不是像SYSTEM…
当前回答
要获取mysql的当前时区，你可以做以下事情:
SELECT @@system_time_zone; # from this you can get the system timezone
SELECT IF(@@session.time_zone = 'SYSTEM', @@system_time_zone, @@session.time_zone) # This will give you time zone if system timezone is different from global timezone
现在如果你想改变mysql时区，那么:
SET GLOBAL time_zone = '+00:00'; # this will set mysql timezone in UTC
SET @@session.time_zone = "+00:00"; # by this you can chnage the timezone only for your particular session
其他回答
我的PHP框架使用
SET LOCAL time_zone='Whatever'
在connect之后，where 'Whatever' == date_default_timezone_get()
这不是我的解决方案，但这可以确保MySQL服务器的系统时区始终与PHP的时区相同
因此，是的，PHP强烈地参与其中，并可以影响它
要获取mysql的当前时区，你可以做以下事情:
SELECT @@system_time_zone; # from this you can get the system timezone
SELECT IF(@@session.time_zone = 'SYSTEM', @@system_time_zone, @@session.time_zone) # This will give you time zone if system timezone is different from global timezone
现在如果你想改变mysql时区，那么:
SET GLOBAL time_zone = '+00:00'; # this will set mysql timezone in UTC
SET @@session.time_zone = "+00:00"; # by this you can chnage the timezone only for your particular session
Use LPAD(TIME_FORMAT(TIMEDIFF(NOW(), UTC_TIMESTAMP),’%H:%i’),6,’+') to get a value in MySQL's timezone format that you can conveniently use with CONVERT_TZ(). Note that the timezone offset you get is only valid at the moment in time where the expression is evaluated since the offset may change over time if you have daylight savings time. Yet the expression is useful together with NOW() to store the offset with the local time, which disambiguates what NOW() yields. (In DST timezones, NOW() jumps back one hour once a year, thus has some duplicate values for distinct points in time).
如果需要将GMT差值作为整数:
SELECT EXTRACT(HOUR FROM (TIMEDIFF(NOW(), UTC_TIMESTAMP))) AS `timezone`
将一个虚拟记录插入到具有时间戳的数据库中 选择该记录并获取时间戳的值。 删除该记录。获取服务器写入数据时使用的时区，忽略PHP时区。
