Simplified django.utils.dateformat methods.
Simplified django.utils.dateformat methods.

This removes unnecessary format('O') call, remove unnecessary method
calls for simple cases in TimeFormat, and simplifies time zone handling
in TimeFormat.

rsalmaso/django,apollo13/django,pauloxnet/django,atul-bhouraskar/django,pauloxnet/django,ghickman/django,MarkusH/django,shaib/django,dsanders11/django,solarissmoke/django,takis/django,manhhomienbienthuy/django,monetate/django,shaib/django,blighj/django,felixxm/django,shaib/django,pauloxnet/django,takis/django,felixxm/django,dsanders11/django,apollo13/django,MarkusH/django,dsanders11/django,rsalmaso/django,manhhomienbienthuy/django,ghickman/django,felixxm/django,atul-bhouraskar/django,auvipy/django,ghickman/django,django/django,felixxm/django,auvipy/django,monetate/django,auvipy/django,monetate/django,apollo13/django,auvipy/django,django/django,solarissmoke/django,MarkusH/django,dsanders11/django,manhhomienbienthuy/django,rsalmaso/django,shaib/django,apollo13/django,ghickman/django,solarissmoke/django,atul-bhouraskar/django,manhhomienbienthuy/django,django/django,pauloxnet/django,takis/django,atul-bhouraskar/django,django/django,monetate/django,rsalmaso/django,solarissmoke/django,blighj/django,blighj/django,blighj/django,takis/django,MarkusH/django