Specify timezone in pydantic datetime field [Python]

Question

I have a model where i have datetime type fields defined as shown:

class DamBaseModel(BaseModel):

    class Config:
        allow_population_by_field_name = True
        use_enum_values = True
        arbitrary_types_allowed = True
        json_encoders = {
            ObjectId: str,
            datetime: lambda d: d.isoformat
        }

The defined Model is as follows:

class Message(DamBaseModel):
    created_datetime: datetime = Field(default_factory=datetime.now)

The data that gets inserted into MongoDb is :

{ "created_datetime" : ISODate("2022-08-22T12:02:59.546Z") }

But the problem iam currently facing is that the data is received at the client level in this format :

{ "created_datetime": "Mon, 22 Aug 2022 12:02:59 GMT" }

Iam just fetching the data from the db and projecting it directly without any formatting. Any help as to how to specify local timezone when projecting the data ??

Answer 1

Timezone aware timestamps are now supported in Pydantic V2:

from pydantic import AwareDatetime, TypeAdapter


dt = AwareDatetime
ta = TypeAdapter(dt)

# validate UTC timestamp
ta.validate_python("2022-08-22T12:02:59.546Z")

# Validate timestamp with timezone
ta.validate_python("2022-08-22T12:02:59.546+00:00")