Use microsecond precision to log response time

lib/connect-logger.js

@@ -54,7 +54,7 @@ function getLogger(logger4js, options) {
 		if (nolog && nolog.test(req.originalUrl)) return next();
 		if (thislogger.isLevelEnabled(level) || options.level === 'auto') {
 
-			var start = new Date()
+			var start = process.hrtime()
 			, statusCode
 			, writeHead = res.writeHead
 			, url = req.originalUrl;
@@ -81,7 +81,8 @@ function getLogger(logger4js, options) {
 
 			//hook on end request to emit the log entry of the HTTP request.
 			res.on('finish', function() {
-				res.responseTime = new Date() - start;
+                                var end = process.hrtime();
+                                res.responseTime = (end[0] - start[0]) * 1000 + (end[1] - start[1]) / 1000000;
 				//status code response level handling
 				if(res.statusCode && options.level === 'auto'){
 					level = levels.INFO;