diff --git a/apis_ontology/migrations/0045_rename_end_start_date_event_end_date_from_and_more.py b/apis_ontology/migrations/0045_rename_end_start_date_event_end_date_from_and_more.py
new file mode 100644
index 0000000..7fab0df
--- /dev/null
+++ b/apis_ontology/migrations/0045_rename_end_start_date_event_end_date_from_and_more.py
@@ -0,0 +1,119 @@
+# Generated by Django 5.1.4 on 2024-12-20 07:33
+
+import django_interval.fields
+from django.db import migrations
+
+migration_list = lambda model: [
+    migrations.RenameField(
+        model_name=model,
+        old_name='end_date_written',
+        new_name='end',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='end_start_date',
+        new_name='end_date_from',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='end_date',
+        new_name='end_date_sort',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='end_end_date',
+        new_name='end_date_to',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='start_date_written',
+        new_name='start',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='start_start_date',
+        new_name='start_date_from',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='start_date',
+        new_name='start_date_sort',
+    ),
+    migrations.RenameField(
+        model_name=model,
+        old_name='start_end_date',
+        new_name='start_date_to',
+    ),
+    migrations.AlterField(
+        model_name=model,
+        name='start',
+        field=django_interval.fields.FuzzyDateParserField(blank=True, max_length=255, null=True, verbose_name='Start'),
+    ),
+    migrations.AlterField(
+        model_name=model,
+        name='end',
+        field=django_interval.fields.FuzzyDateParserField(blank=True, max_length=255, null=True, verbose_name='Start'),
+    ),
+]
+entities = ['event', 'institution', 'person', 'place', 'work']
+relations = [
+        'hatreligionszugehoerigkeit',
+        'personeventlegacyrelation',
+        'personinstitutionlegacyrelation',
+        'personpersonlegacyrelation',
+        'institutioninstitutionlegacyrelation',
+        'personplacelegacyrelation',
+        'personworklegacyrelation',
+        'placeplacelegacyrelation',
+        'wargeschwistervon',
+        'warschwagerschwaegerinvon',
+        'warschwiegersohnschwiegertochtervon',
+        'warverwandtmit',
+        'hattealstrauzeugenzeugin',
+        'warpatenkindvon',
+        'dissertiertebeiunter',
+        'wurdegeborenin',
+        'starbin',
+        'erhieltausbildungin',
+        'wirkteforschtehieltsichaufin',
+        'studiertelerntean',
+        'habilitiertesichan',
+        'warassistentinan',
+        'warprivatdozentinan',
+        'warotitoprofessorinan',
+        'waraotitaoprofessorinan',
+        'warhonorarprofessorinan',
+        'warehrendoktorinan',
+        'wartaetigfuerwirkteanbei',
+        'warmitgruenderinvon',
+        'hatteleitungsfunktionan',
+        'warmitgliedvon',
+        'wargrossvatermuttervon',
+        'warrektorinan',
+        'wardekaninan',
+        'promoviertean',
+        'kaempfteinbei',
+        'warprofessorinan',
+        'graduiertean',
+        'mitbiographiertunter',
+        'warhonorardozentinan',
+        'hatteleitungsfunktionbei',
+        'nahmteilan',
+        'warelternteilvon',
+        'warschuelerinvon',
+        'warverheiratetmit',
+        'standinkontaktmit',
+        'arbeitetezusammenmit',
+        'wurdeerhobenin',
+        'wargeburtstitelvon',
+        'fandstattin']
+allmodels = entities + relations + [f"version{entity}" for entity in entities] + [f"version{relation}" for relation in relations]
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('apis_ontology', '0044_person_alternative_names_new_and_more'),
+    ]
+
+    operations = [item for model in allmodels for item in migration_list(model)]
diff --git a/apis_ontology/models.py b/apis_ontology/models.py
index d31befb..9190cf1 100644
--- a/apis_ontology/models.py
+++ b/apis_ontology/models.py
@@ -6,16 +6,24 @@
 from django.utils.translation import gettext_lazy as _
 
 from apis_core.apis_entities.models import AbstractEntity
-from apis_core.core.models import LegacyDateMixin
 from apis_core.utils.helpers import create_object_from_uri
 from apis_core.generic.abc import GenericModel
 from apis_core.apis_entities.abc import E53_Place
 from apis_core.history.models import VersionMixin
 from django_json_editor_field.fields import JSONEditorField
+from django_interval.fields import FuzzyDateParserField
 
 from auditlog.registry import auditlog
 
 
+class LegacyDateMixin(models.Model):
+    start = FuzzyDateParserField(max_length=255, blank=True, null=True, verbose_name=_("Start"))
+    end = FuzzyDateParserField(max_length=255, blank=True, null=True, verbose_name=_("End"))
+
+    class Meta:
+        abstract = True
+
+
 class OEBLBaseEntity:
     pass