diff --git a/telegram/ext/jobqueue.py b/telegram/ext/jobqueue.py
index e17957342..058bf5904 100644
--- a/telegram/ext/jobqueue.py
+++ b/telegram/ext/jobqueue.py
@@ -285,7 +285,7 @@ class JobQueue(object):
             if job.enabled:
                 try:
                     current_week_day = datetime.datetime.now(job.tzinfo).date().weekday()
-                    if any(day == current_week_day for day in job.days):
+                    if current_week_day in job.days:
                         self.logger.debug('Running job %s', job.name)
                         job.run(self._dispatcher)
 
@@ -400,7 +400,7 @@ class Job(object):
                  days=Days.EVERY_DAY,
                  name=None,
                  job_queue=None,
-                 tzinfo=_UTC):
+                 tzinfo=None):
 
         self.callback = callback
         self.context = context
@@ -413,7 +413,7 @@ class Job(object):
 
         self._days = None
         self.days = days
-        self.tzinfo = tzinfo
+        self.tzinfo = tzinfo or _UTC
 
         self._job_queue = weakref.proxy(job_queue) if job_queue is not None else None
 
diff --git a/tests/test_jobqueue.py b/tests/test_jobqueue.py
index 5bdefbfb0..7179f53bd 100644
--- a/tests/test_jobqueue.py
+++ b/tests/test_jobqueue.py
@@ -28,7 +28,7 @@ from flaky import flaky
 
 from telegram.ext import JobQueue, Updater, Job, CallbackContext
 from telegram.utils.deprecate import TelegramDeprecationWarning
-from telegram.utils.helpers import _UtcOffsetTimezone
+from telegram.utils.helpers import _UtcOffsetTimezone, _UTC
 
 
 @pytest.fixture(scope='function')
@@ -330,3 +330,14 @@ class TestJobQueue(object):
         sleep(0.03)
 
         assert self.result == 0
+
+    def test_job_default_tzinfo(self, job_queue):
+        """Test that default tzinfo is always set to UTC"""
+        job_1 = job_queue.run_once(self.job_run_once, 0.01)
+        job_2 = job_queue.run_repeating(self.job_run_once, 10)
+        job_3 = job_queue.run_daily(self.job_run_once, time=dtm.time(hour=15))
+
+        jobs = [job_1, job_2, job_3]
+
+        for job in jobs:
+            assert job.tzinfo == _UTC