i18n: merged to [992] from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/i18n@993 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 52 insertions, 0 deletions

diff --git a/django/utils/tzinfo.py b/django/utils/tzinfo.py
new file mode 100644
index 0000000000..cc9f028e91
--- /dev/null
+++ b/django/utils/tzinfo.py
@@ -0,0 +1,52 @@
+"Implementation of tzinfo classes for use with datetime.datetime."
+
+import time
+from datetime import timedelta, tzinfo
+
+class FixedOffset(tzinfo):
+    "Fixed offset in minutes east from UTC."
+    def __init__(self, offset):
+        self.__offset = timedelta(minutes=offset)
+        self.__name = "%+03d%02d" % (offset // 60, offset % 60)
+
+    def __repr__(self):
+        return self.__name
+
+    def utcoffset(self, dt):
+        return self.__offset
+
+    def tzname(self, dt):
+        return self.__name
+
+    def dst(self, dt):
+        return timedelta(0)
+
+class LocalTimezone(tzinfo):
+    "Proxy timezone information from time module."
+    def __init__(self, dt):
+        tzinfo.__init__(self, dt)
+        self._tzname = time.tzname[self._isdst(dt)]
+
+    def __repr__(self):
+        return self._tzname
+
+    def utcoffset(self, dt):
+        if self._isdst(dt):
+            return timedelta(seconds=-time.altzone)
+        else:
+            return timedelta(seconds=-time.timezone)
+
+    def dst(self, dt):
+        if self._isdst(dt):
+            return timedelta(seconds=-time.altzone) - timedelta(seconds=-time.timezone)
+        else:
+            return timedelta(0)
+
+    def tzname(self, dt):
+        return time.tzname[self._isdst(dt)]
+
+    def _isdst(self, dt):
+        tt = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second, dt.weekday(), 0, -1)
+        stamp = time.mktime(tt)
+        tt = time.localtime(stamp)
+        return tt.tm_isdst > 0