Optimize the timezone datetime return encoder (#767)

* Optimize the timezone datetime return encoder

* Update the default datetime conversion

backend/common/schema.py

@@ -5,7 +5,7 @@ from typing import Annotated
 
 from pydantic import BaseModel, ConfigDict, EmailStr, Field, validate_email
 
-from backend.core.conf import settings
+from backend.utils.timezone import timezone
 
 # 自定义验证错误信息，参考：
 # https://github.com/pydantic/pydantic-core/blob/a5cb7382643415b716b1a7a5392914e50f726528/tests/test_errors.py#L266
@@ -124,5 +124,9 @@ class SchemaBase(BaseModel):
 
     model_config = ConfigDict(
         use_enum_values=True,
-        json_encoders={datetime: lambda x: x.strftime(settings.DATETIME_FORMAT)},
+        json_encoders={
+            datetime: lambda x: timezone.to_str(timezone.from_datetime(x))
+            if x.tzinfo is not None
+            else timezone.to_str(x)
+        },
     )