Skip campaign events with unrepresentable times on the contact timeline

temba/contacts/models.py

@@ -735,11 +735,14 @@ def _get_campaign_events(self, campaigns) -> list:
                 if anchor is None:  # contact has no value for this event's anchor field
                     continue
 
-                when = anchor + event.get_offset()
-                if event.delivery_hour >= 0 and event.unit in (CampaignEvent.UNIT_DAYS, CampaignEvent.UNIT_WEEKS):
-                    when = when.astimezone(self.org.timezone).replace(
-                        hour=event.delivery_hour, minute=0, second=0, microsecond=0
-                    )
+                try:
+                    when = anchor + event.get_offset()
+                    if event.delivery_hour >= 0 and event.unit in (CampaignEvent.UNIT_DAYS, CampaignEvent.UNIT_WEEKS):
+                        when = when.astimezone(self.org.timezone).replace(
+                            hour=event.delivery_hour, minute=0, second=0, microsecond=0
+                        )
+                except OverflowError:  # anchor is so close to the min/max date that the event time isn't representable
+                    continue
 
                 obj = {
                     "type": "campaign_event",

temba/contacts/tests/test_contactcrudl.py

@@ -1350,11 +1350,27 @@ def test_timeline_inactive_and_missing_anchor(self):
         inactive.is_active = False
         inactive.save(update_fields=("is_active",))
 
+        # an event on a field whose value is so early that the event time isn't representable -> omitted
+        due = self.create_field("due", "Due On", value_type=ContactField.TYPE_DATETIME)
+        contact.fields[str(due.uuid)] = {"text": "0001-01-01", "datetime": "0001-01-01T00:00:00-06:36"}
+        contact.save(update_fields=("fields",))
+        CampaignEvent.create_message_event(
+            self.org,
+            self.admin,
+            campaign,
+            due,
+            -3,
+            unit="D",
+            translations={"eng": {"text": "Overflow"}},
+            base_language="eng",
+        )
+
         response = self.requestView(timeline_url, self.admin)
         future = response.json()["future"]
 
         # only the single visible event survives
         self.assertEqual(1, len(future))
+        self.assertEqual([], response.json()["past"])
         self.assertEqual(1, response.json()["future_count"])
         self.assertEqual(reverse("campaigns.campaign_read", args=[campaign.uuid]), future[0]["url"])
         self.assertEqual("Visible", future[0]["message"])