Make it harder for dates way in the past to enter the system

The input components even allow adding setting dates before christus,
but then retrieving the rows back from the DB is impossible:

    File "django/db/models/sql/compiler.py", line 1661, in execute_sql
      return list(result)
    File "django/db/models/sql/compiler.py", line 2171, in cursor_iter
      for rows in iter((lambda: cursor.fetchmany(itersize)), sentinel):
    File "django/db/models/sql/compiler.py", line 2171, in <lambda>
      for rows in iter((lambda: cursor.fetchmany(itersize)), sentinel):
    File "django/db/utils.py", line 98, in inner
      return func(*args, **kwargs)
    ValueError: year -1 is out of range

src/pretix/api/apps.py

@@ -27,4 +27,4 @@ class PretixApiConfig(AppConfig):
     label = 'pretixapi'
 
     def ready(self):
-        from . import signals, webhooks  # noqa
+        from . import monkeypatches, signals, webhooks  # noqa

src/pretix/api/monkeypatches.py

@@ -0,0 +1,27 @@
+import datetime
+
+from django.db import models
+from rest_framework import serializers
+from rest_framework.exceptions import ValidationError
+
+
+class CustomDateField(serializers.DateField):
+    def to_internal_value(self, value):
+        val = super().to_internal_value(value)
+        if val < datetime.date(1900, 1, 1):
+            raise ValidationError("Do not pass dates before 1900-01-01")
+        return val
+
+
+class CustomDateTimeField(serializers.DateTimeField):
+    def to_internal_value(self, value):
+        val = super().to_internal_value(value)
+        if val < datetime.datetime(1900, 1, 1, tzinfo=datetime.timezone.utc):
+            raise ValidationError("Do not pass dates before 1900-01-01")
+        return val
+
+
+serializers.ModelSerializer.serializer_field_mapping.update({
+    models.DateField: CustomDateField,
+    models.DateTimeField: CustomDateTimeField,
+})

src/pretix/control/forms/__init__.py

@@ -424,6 +424,8 @@ class SplitDateTimeField(forms.SplitDateTimeField):
                 return None
             if data_list[1] in self.empty_values:
                 raise ValidationError(self.error_messages['invalid_date'], code='invalid_date')
+            if data_list[0] < datetime.date(1900, 1, 1):
+                raise ValidationError(self.error_messages['invalid_date'], code='invalid_date')
             result = datetime.datetime.combine(*data_list)
             return from_current_timezone(result)
         return None

src/pretix/static/pretixcontrol/js/ui/main.js

@@ -166,6 +166,8 @@ let form_handlers = function (el) {
 		if ($(this).is('[data-min]')) {
 			opts['minDate'] = $(this).attr('data-min')
 			opts['viewDate'] = $(this).attr('data-min')
+		} else {
+			opts['minDate'] = '1900-01-01'
 		}
 		if ($(this).is('[data-max]')) {
 			opts['maxDate'] = $(this).attr('data-max')

src/pretix/static/pretixpresale/js/ui/main.js

@@ -54,6 +54,8 @@ let form_handlers = function (el) {
 		if ($(this).is('[data-min]')) {
 			opts['minDate'] = $(this).attr('data-min')
 			opts['viewDate'] = $(this).attr('data-min')
+		} else {
+			opts['minDate'] = '1900-01-01'
 		}
 		if ($(this).is('[data-max]')) {
 			opts['maxDate'] = $(this).attr('data-max')

src/tests/api/test_events.py

@@ -365,6 +365,32 @@ def test_event_create(team, token_client, organizer, event, meta_prop):
     assert resp.status_code == 400
     assert resp.content.decode() == '{"slug":["This slug has already been used for a different event."]}'
 
+    resp = token_client.post(
+        '/api/v1/organizers/{}/events/'.format(organizer.slug),
+        {
+            "name": {
+                "de": "Demo Konference 2020 Test",
+                "en": "Demo Conference 2020 Test"
+            },
+            "live": False,
+            "currency": "EUR",
+            "date_from": "1817-12-27T10:00:00Z",
+            "date_to": "1817-12-28T10:00:00Z",
+            "date_admission": None,
+            "is_public": False,
+            "presale_start": None,
+            "presale_end": None,
+            "location": None,
+            "slug": "newslug",
+            "meta_data": {
+                "type": "Conference"
+            }
+        },
+        format='json'
+    )
+    assert resp.status_code == 400
+    assert resp.content.decode() == '{"date_from":["Do not pass dates before 1900-01-01"],"date_to":["Do not pass dates before 1900-01-01"]}'
+
     resp = token_client.post(
         '/api/v1/organizers/{}/events/'.format(organizer.slug),
         {