datetime.py

import pytz
from sqlalchemy import types
from sqlalchemy.types import TypeDecorator

tz = pytz.timezone('Asia/Seoul')


class TZDateTime(TypeDecorator):
    impl = types.DateTime

    def process_bind_param(self, value, dialect):
        if value is None:
            return None
        return value.astimezone(tz).replace(tzinfo=None)

    def process_result_value(self, value, dialect):
        if value is None:
            return None
        return value.replace(tzinfo=pytz.utc).astimezone(tz)

models.py

class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True, autoincrement=True)
    created_at = Column(TZDateTime, index=True, default=func.now())
    updated_at = Column(TZDateTime, default=func.now())

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