php - How to convert time zone within mysql statement

Question

I am trying to convert a unix timestamp into a local time using mysql.

The statement I am trying is:

SELECT CONVERT_TZ('FROM_UNIXTIME(table1.timestamp)', 'GMT', 'MET' ),table1.COL2,table1.COL3 WHERE table1ID ='3'

It returns NULL.

I would prefer to do this directly in mysql rather than manipulating the output later using php to keep other parts of my code simple.

Thanks in advance for any help.

Answer 1

尝试删除您'FROM_UNIXTIME(table1.timestamp)'喜欢的报价：

SELECT CONVERT_TZ(FROM_UNIXTIME(table1.timestamp), 'GMT', 'MET' ),table1.COL2,table1.COL3 WHERE table1ID ='3'

Answer 2

周围的引号FROM_UNIXTIME(table1.timestamp)使它成为一个字符串，它看起来不像一个日期。您必须删除引号才能使其成为函数调用。

完成后，您仍然可能会得到NULL. 通过运行测试查询对其进行测试：SELECT CONVERT_TZ('2004-01-01 12:00:00','GMT','MET');

如果你仍然得到NULL，你可能需要设置你的时区表。请参阅有关主题的 MySQL 文档。