diff --git a/setup.py b/setup.py
index c657ec9..01d922e 100755
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,7 @@ setuptools.setup(name='warcprox',
             'Programming Language :: Python :: 3',
             'Programming Language :: Python :: 3.2',
             'Programming Language :: Python :: 3.3',
+            'Programming Language :: Python :: 3.4',
             'Topic :: Internet :: Proxy Servers',
             'Topic :: Internet :: WWW/HTTP',
             'Topic :: Software Development :: Libraries :: Python Modules',
diff --git a/warcprox/warcprox.py b/warcprox/warcprox.py
index f2d869b..4410ca6 100644
--- a/warcprox/warcprox.py
+++ b/warcprox/warcprox.py
@@ -748,7 +748,7 @@ class WarcWriterThread(threading.Thread):
 
     # returns a tuple (principal_record, request_record) where principal_record is either a response or revisit record
     def build_warc_records(self, recorded_url):
-        warc_date = warctools.warc.warc_datetime_str(datetime.now())
+        warc_date = warctools.warc.warc_datetime_str(datetime.utcnow())
 
         dedup_info = None
         if self.dedup_db is not None and recorded_url.response_recorder.payload_digest is not None:
@@ -802,7 +802,7 @@ class WarcWriterThread(threading.Thread):
         refers_to_date=None):
 
         if warc_date is None:
-            warc_date = warctools.warc.warc_datetime_str(datetime.now())
+            warc_date = warctools.warc.warc_datetime_str(datetime.utcnow())
 
         record_id = warctools.WarcRecord.random_warc_uuid()
 
@@ -851,7 +851,7 @@ class WarcWriterThread(threading.Thread):
 
 
     def timestamp17(self):
-        now = datetime.now()
+        now = datetime.utcnow()
         return '{}{}'.format(now.strftime('%Y%m%d%H%M%S'), now.microsecond//1000)
 
     def _close_writer(self):
@@ -865,7 +865,7 @@ class WarcWriterThread(threading.Thread):
             self._f = None
 
     def _build_warcinfo_record(self, filename):
-        warc_record_date = warctools.warc.warc_datetime_str(datetime.now())
+        warc_record_date = warctools.warc.warc_datetime_str(datetime.utcnow())
         record_id = warctools.WarcRecord.random_warc_uuid()
 
         headers = []