Remove get_tz_aware_utcnow and Use Django's functions for timezones.
Review Request #3036 — Created April 1, 2012 and submitted
Remove get_tz_aware_utcnow and Use Django's functions for timezones. The get_tz_aware_utcnow duplicates functionality from django.utils.timezones.now. Review Board has moved to Django's function, so we can remove this now. All code has been updated.
Djblets and Review Board unit tests pass.
