Comments on: Time zones in Google App Engine

By: Jon Rosebaugh

Jon Rosebaugh — Wed, 25 Nov 2009 09:57:28 +0000

Yeah, that does make sense.

By: Ben Davies

Ben Davies — Wed, 25 Nov 2009 09:43:07 +0000

Thanks - this code sample and your explanation is really useful. I am only new to python (started with Google App Engine) but I needed to make a change to your code to avoid errors with entities without values in the TzDateTimeProperty.

def make_value_from_datastore(self, value):
value = super(TzDateTimeProperty, self).
make_value_from_datastore(value)
#Added this check to see if the property had a value
if value is not None:
if value.tzinfo is None:
value = value.replace(tzinfo=pytz.utc)
else:
value = value.astimezone(pytz.utc)
return value

Thanks again and let me know if the above change makes sense. (Works for me)

By: jdeibele

jdeibele — Mon, 10 Aug 2009 08:02:53 +0000

I'm trying to write out log data in a way that is more user-friendly. So rather than showing the UTC time, I want to show it in Pacific time and let the user change it.

I'm new to Python and Django. Can you give simple examples of how to use this?

Thanks very much for sharing.