I'm trying to modify my nginx access log format to include the request duration, in seconds.

I see two possible variables I could use:

1) $request_time (http://wiki.nginx.org/HttpLogModule#log_format)

2) $upstream_response_time (http://wiki.nginx.org/NginxHttpUpstreamModule#.24upstream_response_time)

However both of these variables are expressed in microseconds, and I need this value to be rendered in seconds. Is there any way to specify the output as an expression (i.e. $request_time * 1000) or accomplish this in some other way?

Thanks,
Tharsan