diff --git a/src/github_issues_import/models.py b/src/github_issues_import/models.py
index ff6ffbb..1b3ef4d 100644
--- a/src/github_issues_import/models.py
+++ b/src/github_issues_import/models.py
@@ -1,8 +1,8 @@
 from datetime import datetime
 from typing import Literal
 
+from pydantic import AwareDatetime, ConfigDict, HttpUrl, NaiveDatetime
 from pydantic import BaseModel as PydanticBaseModel
-from pydantic import ConfigDict, HttpUrl
 
 DEFAULT_CONFIG = ConfigDict(
     populate_by_name=True,
@@ -16,12 +16,15 @@ class BaseModel(PydanticBaseModel):
     model_config = DEFAULT_CONFIG
 
 
+type Datetime = datetime | AwareDatetime | NaiveDatetime
+
+
 class Issue(BaseModel):
     title: str
     body: str
-    created_at: datetime | None = None
-    updated_at: datetime | None = None
-    closed_at: datetime | None = None
+    created_at: Datetime | None = None
+    updated_at: Datetime | None = None
+    closed_at: Datetime | None = None
     assignee: str | None = None
     milestone: int | None = None
     closed: bool | None = None
@@ -30,7 +33,7 @@ class Issue(BaseModel):
 
 class Comment(BaseModel):
     body: str
-    created_at: datetime | None = None
+    created_at: Datetime | None = None
 
 
 class IssueImportRequest(BaseModel):