Internal Server Error: /admin/django_comments/comment/
Traceback (most recent call last):
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/core/handlers/base.py", line 164, in get_response
    response = response.render()
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/response.py", line 158, in render
    self.content = self.rendered_content
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/response.py", line 135, in rendered_content
    content = template.render(context, self._request)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/backends/django.py", line 74, in render
    return self.template.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 210, in render
    return self._render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 202, in _render
    return self.nodelist.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render
    bit = self.render_node(node, context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
    return node.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 135, in render
    return compiled_parent._render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 202, in _render
    return self.nodelist.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render
    bit = self.render_node(node, context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
    return node.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 135, in render
    return compiled_parent._render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 202, in _render
    return self.nodelist.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render
    bit = self.render_node(node, context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
    return node.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 65, in render
    result = block.nodelist.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render
    bit = self.render_node(node, context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
    return node.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/loader_tags.py", line 65, in render
    result = block.nodelist.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 905, in render
    bit = self.render_node(node, context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
    return node.render(context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/template/base.py", line 1273, in render
    _dict = func(*resolved_args, **resolved_kwargs)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/contrib/admin/templatetags/admin_list.py", line 397, in date_hierarchy
    } for year in years]
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/query.py", line 162, in __iter__
    self._fetch_all()
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/query.py", line 965, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/query.py", line 1217, in iterator
    for row in compiler.results_iter():
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 800, in results_iter
    row = self.apply_converters(row, converters)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 784, in apply_converters
    value = converter(value, expression, self.connection, self.query.context)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/expressions.py", line 927, in convert_value
    "Database returned an invalid value in QuerySet.datetimes(). "
ValueError: Database returned an invalid value in QuerySet.datetimes(). Are time zone definitions for your database and pytz installed?