Question

i tried to use this sql:

SELECT date_format(signdate , '%Y-%c-%d %h:%i:%s' ) as post_date , 
date_format(NOW(), '%Y-%c-%d %h:%i:%s' ) as post_date_gmt 
FROM `article`  where outkey = 'Y'

the result of post_date is null, but post_date is working. so how can i use the funciton date_format to format signdate (ex: signdate is 1095959971)?

Answer 1

DATE_FORMAT expects a DATETIME column.

You’d have to cast it:

DATE_FORMAT(CAST(signdate AS DATETIME), ....)

It would be better to have a real DATETIME field, though.