Can SQLAlchemy DateTime Objects Only Be Naive?
I am working with SQLAlchemy, and I'm not yet sure which database I'll use under it, so I want to remain as DB-agnostic as possible. How can I store a timezone-aware datetime object in the DB without tying myself to a specific database? Right now, I'm making sure that times are UTC before I store them in the DB, and converting to localized at display-time, but that feels inelegant and brittle. Is there a DB-agnostic way to get a timezone-aware datetime out of SQLAlchemy instead of getting naive datatime objects out of the DB?
There is a timezone parameter to DateTime column time, so there is no problem with storing timezone-aware datetime objects. However I found convenient to convert stored datetime to UTC automatically with simple type decorator:
from sqlalchemy import types from dateutil.tz import tzutc from datetime import datetime class UTCDateTime(types.TypeDecorator): impl = types.DateTime def process_bind_param(self, value, engine): if value is not None: return value.astimezone(tzutc()) def process_result_value(self, value, engine): if value is not None: return datetime(value.year, value.month, value.day, value.hour, value.minute, value.second, value.microsecond, tzinfo=tzutc())
Note, that is behaves nicely when you use naive datetime by accident (meaning it will raise a ValueError).