attribute 'tzinfo' of 'datetime.datetime' objects is not writable

Question

How do I set the timezone of a datetime instance that just came out of the datastore?

When it first comes out it is in UTC. I want to change it to EST.

I\'m try

Answer 1

If you're receiving a datetime that's in EST, but doesn't have its tzinfo field set, use dt.replace(tzinfo=tz) to assign a tzinfo without modifying the time. (Your database should be doing this for you.)

If you're receiving a datetime that's in UDT, and you want it in EST, then you need astimezone. http://docs.python.org/library/datetime.html#datetime.datetime.astimezone

In the vast majority of cases, your database should be storing and returning data in UDT, and you shouldn't need to use replace (except possibly to assign a UDT tzinfo).