Use date instead of datetime in ModuleEngagementMetricRanges.

analytics_data_api/management/commands/generate_fake_course_data.py

@@ -270,5 +270,5 @@ class Command(BaseCommand):
         self.generate_video_data(course_id, video_id, video_module_id)
         self.generate_video_timeline_data(video_id)
         self.generate_learner_engagement_data(course_id, username, start_date, end_date)
-        self.generate_learner_engagement_range_data(course_id, start_date, end_date)
+        self.generate_learner_engagement_range_data(course_id, start_date.date(), end_date.date())
         self.generate_tags_distribution_data(course_id)

analytics_data_api/v0/models.py

@@ -495,9 +495,9 @@ class ModuleEngagementMetricRanges(models.Model):
     """
 
     course_id = models.CharField(db_index=True, max_length=255)
-    start_date = models.DateTimeField()
+    start_date = models.DateField()
     # This is a left-closed interval. No data from the end_date is included in the analysis.
-    end_date = models.DateTimeField()
+    end_date = models.DateField()
     metric = models.CharField(max_length=50)
     range_type = models.CharField(max_length=50)
     # Also a left-closed interval, so any metric whose value is equal to the high_value

analytics_data_api/v0/serializers.py

@@ -447,8 +447,8 @@ class EngagementDaySerializer(serializers.Serializer):
 
 # pylint: disable=abstract-method
 class DateRangeSerializer(serializers.Serializer):
-    start = serializers.DateTimeField(source='start_date', format=settings.DATE_FORMAT)
-    end = serializers.DateTimeField(source='end_date', format=settings.DATE_FORMAT)
+    start = serializers.DateField(source='start_date', format=settings.DATE_FORMAT)
+    end = serializers.DateField(source='end_date', format=settings.DATE_FORMAT)
 
 
 # pylint: disable=abstract-method

analytics_data_api/v0/tests/views/test_learners.py

@@ -10,7 +10,6 @@ import ddt
 from django_dynamic_fixture import G
 from elasticsearch import Elasticsearch
 from mock import patch, Mock
-import pytz
 from rest_framework import status
 
 from django.conf import settings
@@ -784,8 +783,8 @@ class CourseLearnerMetadataTests(DemoCourseMixin, VerifyCourseIdMixin,
 
     def test_one_engagement_range(self):
         metric_type = 'problems_completed'
-        start_date = datetime.datetime(2015, 7, 1, tzinfo=pytz.utc)
-        end_date = datetime.datetime(2015, 7, 21, tzinfo=pytz.utc)
+        start_date = datetime.date(2015, 7, 1)
+        end_date = datetime.date(2015, 7, 21)
         G(ModuleEngagementMetricRanges, course_id=self.course_id, start_date=start_date, end_date=end_date,
           metric=metric_type, range_type='normal', low_value=90, high_value=6120)
         expected_ranges = self.empty_engagement_ranges
@@ -807,8 +806,8 @@ class CourseLearnerMetadataTests(DemoCourseMixin, VerifyCourseIdMixin,
 
     def _get_full_engagement_ranges(self):
         """ Populates a full set of engagement ranges and returns the expected engagement ranges. """
-        start_date = datetime.datetime(2015, 7, 1, tzinfo=pytz.utc)
-        end_date = datetime.datetime(2015, 7, 21, tzinfo=pytz.utc)
+        start_date = datetime.date(2015, 7, 1)
+        end_date = datetime.date(2015, 7, 21)
 
         expected = {
             'engagement_ranges': {