How to parse unix timestamp into datetime without timezone in Fast API

Question

Assume I have a pydantic model

class EventEditRequest(BaseModel):
    uid: UUID
    name: str
    start_dt: datetime
    end_dt: datetime

I send request with body b'{"uid":"a38a7543-20ca-4a50-ab4e-e6a3ae379d3c","name":"test event2222","start_dt":1600414328,"end_dt":1600450327}'

So both start_dt and end_dt are unix timestamps. But in endpoint they become datetimes with timezones.

@app.put('...')
def edit_event(event_data: EventEditRequest):
    event_data.start_dt.tzinfo is not None  # True

I don't want to manually edit start_dt and end_dt in the endpoint function to get rid of timezones. How can I set up my pydantic model so it will make datetime without timezones?

Answer 1

You can use own @validator to parse datetime manually:

from datetime import datetime

from pydantic import BaseModel, validator


class Model(BaseModel):
    dt: datetime = None


class ModelNaiveDt(BaseModel):
    dt: datetime = None

    @validator("dt", pre=True)
    def dt_validate(cls, dt):
        return datetime.fromtimestamp(dt)


print(Model(dt=1600414328))
print(ModelNaiveDt(dt=1600414328))

Output:

dt=datetime.datetime(2020, 9, 18, 7, 32, 8, tzinfo=datetime.timezone.utc)
dt=datetime.datetime(2020, 9, 18, 10, 32, 8)