diff --git a/gunicorn/workers/async.py b/gunicorn/workers/async.py
index 9ffa0df4..b1898e99 100644
--- a/gunicorn/workers/async.py
+++ b/gunicorn/workers/async.py
@@ -68,7 +68,7 @@ class AsyncWorker(base.Worker):
                 for item in respiter:
                     resp.write(item)
                 resp.close()
-                request_time = request_start - datetime.now()
+                request_time = datetime.now() - request_start
                 self.log.access(resp, environ, request_time)
             finally:
                 if hasattr(respiter, "close"):
diff --git a/gunicorn/workers/sync.py b/gunicorn/workers/sync.py
index 5c4b65ff..b89830ca 100644
--- a/gunicorn/workers/sync.py
+++ b/gunicorn/workers/sync.py
@@ -104,7 +104,7 @@ class SyncWorker(base.Worker):
                     for item in respiter:
                         resp.write(item)
                 resp.close()
-                request_time = request_start - datetime.now()
+                request_time = datetime.now() - request_start
                 self.log.access(resp, environ, request_time)
             finally:
                 if hasattr(respiter, "close"):