As stated in this answer, the $time_local variable in access log of Nginx means the end time of a request (or close to).
Then, is there some way to log the start time of a request in Nginx access log?
I've googled around but just can't find any references to achive this. Come on! Isn't this a very simple function for a web server? Do not tell me to subtract the $request_time from the $time_local ...