diff --git a/docker/utils/utils.py b/docker/utils/utils.py
index ccb83200..dee98ea7 100644
--- a/docker/utils/utils.py
+++ b/docker/utils/utils.py
@@ -28,6 +28,7 @@ import six
 from .. import errors
 from .. import tls
 
+
 DEFAULT_HTTP_HOST = "127.0.0.1"
 DEFAULT_UNIX_SOCKET = "http+unix://var/run/docker.sock"
 
@@ -299,7 +300,8 @@ def convert_filters(filters):
 
 def datetime_to_timestamp(dt=datetime.now()):
     """Convert a datetime in local timezone to a unix timestamp"""
-    return int((dt - datetime.fromtimestamp(0)).total_seconds())
+    delta = dt - datetime.fromtimestamp(0)
+    return delta.seconds + delta.days * 24 * 3600
 
 
 def create_host_config(
diff --git a/tests/test.py b/tests/test.py
index bd219a8d..bf7b3fbf 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -190,10 +190,10 @@ class DockerClientTest(Cleanup, unittest.TestCase):
         )
 
     def test_events_with_since_until(self):
-        now = datetime.datetime.now()
+        ts = 1356048000
+        now = datetime.datetime.fromtimestamp(ts)
         since = now - datetime.timedelta(seconds=10)
         until = now + datetime.timedelta(seconds=10)
-        ts = int((now - datetime.datetime.fromtimestamp(0)).total_seconds())
         try:
             self.client.events(since=since, until=until)
         except Exception as e:
@@ -210,7 +210,8 @@ class DockerClientTest(Cleanup, unittest.TestCase):
         )
 
     def test_events_with_filters(self):
-        filters = {'event': ['die', 'stop'], 'container': fake_api.FAKE_CONTAINER_ID}
+        filters = {'event': ['die', 'stop'],
+                   'container': fake_api.FAKE_CONTAINER_ID}
         try:
             self.client.events(filters=filters)
         except Exception as e: