manager: display shared custody agenda start and end dates (#71941)

chrono/manager/templates/chrono/manager_shared_custody_agenda_month_view.html

@@ -36,4 +36,16 @@
       <p>{% trans "Configuration is not completed yet." %}</p>
     </div>
   {% endif %}
+
+  <div class="section">
+    {% if agenda.date_end %}
+      {% blocktrans trimmed with date_start=agenda.date_start date_end=agenda.date_end %}
+        This agenda applies from {{ date_start }} to {{ date_end }}.
+      {% endblocktrans %}
+    {% else %}
+      {% blocktrans trimmed with date_start=agenda.date_start %}
+        This agenda applies from {{ date_start }}.
+      {% endblocktrans %}
+    {% endif %}
+  </div>
 {% endblock %}

tests/manager/test_shared_custody_agenda.py

@@ -236,6 +236,8 @@ def test_shared_custody_agenda_month_view_dates(app, admin_user):
     days = [x.text for x in resp.pyquery('tbody tr th span')]
     assert len(days) == 7 * 5
 
+    assert 'This agenda applies from Jan. 1, 2022.' in resp.text
+
     # custody for half the month
     agenda.date_start = datetime.date(2022, 2, 14)
     agenda.save()
@@ -255,6 +257,8 @@ def test_shared_custody_agenda_month_view_dates(app, admin_user):
     assert resp.text.count('<td></td>') == 34
     assert len([x.text for x in resp.pyquery('tbody tr td.guardian')]) == 1
 
+    assert 'This agenda applies from Feb. 14, 2022 to Feb. 14, 2022.' in resp.text
+
     # month before date_start
     resp = resp.click('←')
     assert resp.text.count('<td></td>') == 42