datetime and timezone conversion with pytz - mind blowing behaviour
The documentation http://pytz.sourceforge.net/ states "Unfortunately using the tzinfo argument of the standard datetime constructors 'does not work' with pytz for many timezones." The code:
t = datetime( 2013, 5, 11, hour=11, minute=0, tzinfo=pytz.timezone('Europe/Warsaw'))doesn't work according to this, instead you should use the localize method:
t = pytz.timezone('Europe/Warsaw').localize( datetime(2013, 5, 11, hour=11, minute=0))