摘自：http://serverfault.com/questi...

The $local_time variable contains the time when the log entry is written.

when the HTTP request header is read, nginx does a lookup of the associated virtual server configuration. If the virtual server is found, the request goes through six phases:

• server rewrite phase

• location phase

• location rewrite phase (which can bring the request back to the previous phase)

• access control phase

• try_files phase

• log phase

Since the log phase is the last one, $local_time variable is much more colse to the end of the request than it's start.