get dates timeperiod updates to work better with local time zones

rowers/tests/test_plans.py

@@ -30,6 +30,7 @@ class TrainingPlanTest(TestCase):
         self.r = Rower.objects.create(user=self.u,
                                       birthdate=faker.profile()['birthdate'],
                                       gdproptin=True,surveydone=True,
+                                      defaulttimezone='US/Pacific',
                                       gdproptindate=timezone.now(),
                                       rowerplan='coach')
 
@@ -1238,6 +1239,7 @@ class PlannedSessionsView(TestCase):
                                       birthdate=faker.profile()['birthdate'],
                                       gdproptin=True,surveydone=True,
                                       gdproptindate=timezone.now(),
+                                      defaulttimezone='US/Pacific',
                                       rowerplan='coach')
         self.r.save()
         self.c = Client()