Get storage time without mysql data using PHP.

This is the format of the database

PHP language

This is the result of chrome, other text data can Output, but date is null

Reply content:

This is the format of the database

PHP language

This is the result of chrome, other text data can Output, but date is null

Is there a value in the reg_date field

The problem is solved, but my sql function does not select date, please be careful

Am I the only one who is struggling with the alignment of this code?