{
            "name": "baz",
            "date": datetime(2021, 7, 26),
            "price": 2.0,
            "owner_ids": [1, 2, 3],
        },
    ]


@app.get("/items/objectlist", response_model=List[Item])
def get_objectlist():
    return [
        Item(name="foo", date=datetime(2021, 7, 26)),
        Item(name="bar", date=datetime(2021, 7, 26), price=1.0),

* `datetime.datetime`:
    * Пайтонівський `datetime.datetime`.
    * У запитах та відповідях буде представлений як `str` в форматі ISO 8601, як: `2008-09-15T15:53:00+05:00`.
* `datetime.date`:
    * Пайтонівський `datetime.date`.
    * У запитах та відповідях буде представлений як `str` в форматі ISO 8601, як: `2008-09-15`.
* `datetime.time`:
    * Пайтонівський `datetime.time`.

* `datetime.datetime`:
    * A Python `datetime.datetime`.
    * In requests and responses will be represented as a `str` in ISO 8601 format, like: `2008-09-15T15:53:00+05:00`.
* `datetime.date`:
    * Python `datetime.date`.
    * In requests and responses will be represented as a `str` in ISO 8601 format, like: `2008-09-15`.
* `datetime.time`:
    * A Python `datetime.time`.

    * 在请求和响应中将以 `str` 表示。
* `datetime.datetime`:
    * 一个 Python `datetime.datetime`.
    * 在请求和响应中将表示为 ISO 8601 格式的 `str` ，比如: `2008-09-15T15:53:00+05:00`.
* `datetime.date`:
    * Python `datetime.date`.
    * 在请求和响应中将表示为 ISO 8601 格式的 `str` ，比如: `2008-09-15`.
* `datetime.time`:
    * 一个 Python `datetime.time`.
    * 在请求和响应中将表示为 ISO 8601 格式的 `str` ，比如:  `14:23:55.003`.
* `datetime.timedelta`:
    * 一个 Python `datetime.timedelta`.

from datetime import datetime

from pydantic import BaseModel


class User(BaseModel):
    id: int
    name: str = "John Doe"
    signup_ts: datetime | None = None
    friends: list[int] = []


external_data = {
    "id": "123",
    "signup_ts": "2017-06-01 12:22",
    "friends": [1, "2", b"3"],
}
user = User(**external_data)
print(user)

from collections import deque
from dataclasses import dataclass
from datetime import datetime, timezone
from decimal import Decimal
from enum import Enum
from pathlib import PurePath, PurePosixPath, PureWindowsPath
from typing import Optional

import pytest
from fastapi._compat import PYDANTIC_V2, Undefined
from fastapi.encoders import jsonable_encoder
from pydantic import BaseModel, Field, ValidationError

from datetime import datetime, time, timedelta
from typing import Union
from uuid import UUID

from fastapi import Body, FastAPI

app = FastAPI()


@app.put("/items/{item_id}")
async def read_items(
    item_id: UUID,
    start_datetime: datetime = Body(),
    end_datetime: datetime = Body(),
    process_after: timedelta = Body(),
    repeat_at: Union[time, None] = Body(default=None),
):

from datetime import datetime, time, timedelta
from typing import Union
from uuid import UUID

from fastapi import Body, FastAPI
from typing_extensions import Annotated

app = FastAPI()


@app.put("/items/{item_id}")
async def read_items(
    item_id: UUID,
    start_datetime: Annotated[datetime, Body()],
    end_datetime: Annotated[datetime, Body()],
    process_after: Annotated[timedelta, Body()],

* `datetime.datetime`:
    * Ein Python-`datetime.datetime`.
    * Wird in Requests und Responses als `str` im ISO 8601-Format dargestellt, etwa: `2008-09-15T15:53:00+05:00`.
* `datetime.date`:
    * Python-`datetime.date`.
    * Wird in Requests und Responses als `str` im ISO 8601-Format dargestellt, etwa: `2008-09-15`.
* `datetime.time`:
    * Ein Python-`datetime.time`.

from datetime import datetime, timezone

from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel

from .utils import needs_pydanticv1, needs_pydanticv2


@needs_pydanticv2
def test_pydanticv2():
    from pydantic import field_serializer

    class ModelWithDatetimeField(BaseModel):
        dt_field: datetime

        @field_serializer("dt_field")