Merge pull request #15975 from edx/sstudent/EDUCATOR-1317

common function for cert display date

lms/djangoapps/certificates/tests/test_webview_views.py

@@ -39,6 +39,7 @@ from lms.djangoapps.badges.tests.factories import (
     CourseCompleteImageConfigurationFactory
 )
 from lms.djangoapps.grades.tests.utils import mock_passing_grade
+from openedx.core.djangoapps.certificates.config import waffle
 from openedx.core.lib.tests.assertions.events import assert_event_matches
 from student.roles import CourseStaffRole
 from student.tests.factories import CourseEnrollmentFactory, UserFactory
@@ -819,7 +820,9 @@ class CertificatesViewsTests(CommonCertificatesTestCase):
             expected_date = datetime.datetime.today()
         else:
             expected_date = self.course.certificate_available_date
-        response = self.client.get(test_url)
+        with waffle.waffle().override(waffle.SELF_PACED_ONLY, active=True):
+            with waffle.waffle().override(waffle.INSTRUCTOR_PACED_ONLY, active=True):
+                response = self.client.get(test_url)
         date = '{month} {day}, {year}'.format(
             month=strftime_localized(expected_date, "%B"),
             day=expected_date.day,

lms/djangoapps/certificates/views/webview.py

@@ -41,6 +41,7 @@ from edxmako.shortcuts import render_to_response
 from edxmako.template import Template
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.lib.courses import course_image_url
+from openedx.core.djangoapps.certificates.api import display_date_for_certificate
 from student.models import LinkedInAddToProfileConfiguration
 from util import organizations_helpers as organization_api
 from util.date_utils import strftime_localized
@@ -100,15 +101,7 @@ def _update_certificate_context(context, user_certificate, platform_name):
 
     # Translators:  The format of the date includes the full name of the month
     course = get_course_by_id(user_certificate.course_id) if user_certificate.course_id else None
-    if (
-        course and
-        not course.self_paced and
-        course.certificate_available_date and
-        course.certificate_available_date < datetime.now(pytz.UTC)
-    ):
-        date = course.certificate_available_date
-    else:
-        date = user_certificate.modified_date
+    date = display_date_for_certificate(course, user_certificate)
     context['certificate_date_issued'] = _('{month} {day}, {year}').format(
         month=strftime_localized(date, "%B"),
         day=date.day,

openedx/core/djangoapps/certificates/api.py

 """
 The public API for certificates.
 """
-
+from datetime import datetime
+from pytz import UTC
 from openedx.core.djangoapps.certificates.config import waffle
 
 
@@ -37,3 +38,15 @@ def _enabled_and_self_paced(course):
 
 def can_show_certificate_available_date_field(course):
     return _enabled_and_self_paced(course)
+
+
+def display_date_for_certificate(course, certificate):
+    if (
+        auto_certificate_generation_enabled_for_course(course) and
+        not course.self_paced and
+        course.certificate_available_date and
+        course.certificate_available_date < datetime.now(UTC)
+    ):
+        return course.certificate_available_date
+
+    return certificate.modified_date