The solution to the time zone problem when wordpress uses strtotime

I'm writing a Wordpress Theme I found a problem in the background. The time set in the theme configuration does not match the timestamp output from the foreground. Then the direct foreground printing found a problem:

 $cs_time = strtotime('2022-01-17 09:00:00'); var_dump($cs_time);

The output is "1642410000". The time stamp is converted to "2022-01-17 17:00:00". The time difference is 8 hours.

After some searching, we know that "strtotime" will be transferred to the Greenwich time zone. The problem is wordpress "Shanghai" has been set in the backstage time zone setting (PS: I don't understand what the Shanghai time zone is. It is clear that China has only one Beijing time zone).

This is a problem of egg pain.

After a further search, no solution was found. Baidu's search results were all copied, including the cancer of csdn.

In the end, I really don't want to bother, and the violent solution:

If you have other solutions, please leave a message in the comment area of this article to discuss. If not, use this violent solution.

 $cs_time = strtotime('2022-01-17 09:00:00') - 28800; var_dump($cs_time);