I want to set the timestamp of the directory list returned by the web server to JST.

Lighttpd is a web server on Debian (Strech).
When you access the server from a web client and retrieve the directory list, the file timestamp is returned in UTC.I'd like to change it to return in JST, but what should I set?

I started Lighttpd in the same way on other Debian machines, but it will be returned as JST from the beginning.I looked for a difference in settings between the two servers, but I was at a loss because I couldn't find them.