Fixed #17262 -- Refactored tzinfo implementations.

This commit deprecates django.utils.tzinfo in favor of the more recent
django.utils.timezone which was introduced when Django gained support
for time zones.

docs/internals/deprecation.txt

@@ -417,6 +417,8 @@ these changes.
 
 * ``django.utils.importlib`` will be removed.
 
+* ``django.utils.tzinfo`` will be removed.
+
 * ``django.utils.unittest`` will be removed.
 
 * The ``syncdb`` command will be removed.

docs/ref/utils.txt

@@ -927,6 +927,17 @@ For a complete discussion on the usage of the following see the
 
     :class:`~datetime.tzinfo` instance that represents UTC.
 
+.. function:: get_fixed_timezone(offset)
+
+    .. versionadded:: 1.7
+
+    Returns a :class:`~datetime.tzinfo` instance that represents a time zone
+    with a fixed offset from UTC.
+
+    ``offset`` is a :class:`datetime.timedelta` or an integer number of
+    minutes. Use positive values for time zones east of UTC and negative
+    values for west of UTC.
+
 .. function:: get_default_timezone()
 
     Returns a :class:`~datetime.tzinfo` instance that represents the
@@ -1021,6 +1032,9 @@ For a complete discussion on the usage of the following see the
 ``django.utils.tzinfo``
 =======================
 
+.. deprecated:: 1.7
+    Use :mod:`~django.utils.timezone` instead.
+
 .. module:: django.utils.tzinfo
    :synopsis: Implementation of ``tzinfo`` classes for use with ``datetime.datetime``.
 
@@ -1028,6 +1042,12 @@ For a complete discussion on the usage of the following see the
 
     Fixed offset in minutes east from UTC.
 
+    .. deprecated:: 1.7
+        Use :func:`~django.utils.timezone.get_fixed_timezone` instead.
+
 .. class:: LocalTimezone
 
     Proxy timezone information from time module.
+
+    .. deprecated:: 1.7
+        Use :func:`~django.utils.timezone.get_default_timezone` instead.

docs/releases/1.7.txt

@@ -308,6 +308,16 @@ For apps with migrations, ``allow_migrate`` will now get passed
 without custom attributes, methods or managers. Make sure your ``allow_migrate``
 methods are only referring to fields or other items in ``model._meta``.
 
+pytz may be required
+~~~~~~~~~~~~~~~~~~~~
+
+If your project handles datetimes before 1970 or after 2037 and Django raises
+a :exc:`~exceptions.ValueError` when encountering them, you will have to
+install pytz_. You may be affected by this problem if you use Django's time
+zone-related date formats or :mod:`django.contrib.syndication`.
+
+.. _pytz: https://pypi.python.org/pypi/pytz/
+
 Miscellaneous
 ~~~~~~~~~~~~~
 
@@ -389,6 +399,15 @@ Features deprecated in 1.7
 respectively :mod:`logging.config` and :mod:`importlib` provided for Python
 versions prior to 2.7. They have been deprecated.
 
+``django.utils.tzinfo``
+~~~~~~~~~~~~~~~~~~~~~~~
+
+``django.utils.tzinfo`` provided two :class:`~datetime.tzinfo` subclasses,
+``LocalTimezone`` and ``FixedOffset``. They've been deprecated in favor of
+more correct alternatives provided by :mod:`django.utils.timezone`,
+:func:`django.utils.timezone.get_default_timezone` and
+:func:`django.utils.timezone.get_fixed_timezone`.
+
 ``django.utils.unittest``
 ~~~~~~~~~~~~~~~~~~~~~~~~~