1 files changed, 82 insertions, 0 deletions
diff --git a/webapp/django/utils/tzinfo.py b/webapp/django/utils/tzinfo.py
new file mode 100644
index 0000000000..58cfcd5d88
--- /dev/null
+++ b/webapp/django/utils/tzinfo.py
@@ -0,0 +1,82 @@
+"Implementation of tzinfo classes for use with datetime.datetime."
+
+import locale
+import time
+from datetime import timedelta, tzinfo
+from django.utils.encoding import smart_unicode
+
+try:
+    DEFAULT_ENCODING = locale.getdefaultlocale()[1] or 'ascii'
+except:
+    # Any problems at all determining the locale and we fallback. See #5846.
+    DEFAULT_ENCODING = 'ascii'
+
+class FixedOffset(tzinfo):
+    "Fixed offset in minutes east from UTC."
+    def __init__(self, offset):
+        if isinstance(offset, timedelta):
+            self.__offset = offset
+            offset = self.__offset.seconds // 60
+        else:
+            self.__offset = timedelta(minutes=offset)
+
+        self.__name = u"%+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)
+        self._tzname = self.tzname(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):
+        try:
+            return smart_unicode(time.tzname[self._isdst(dt)], DEFAULT_ENCODING)
+        except UnicodeDecodeError:
+            return None
+
+    def _isdst(self, dt):
+        tt = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second, dt.weekday(), 0, -1)
+        try:
+            stamp = time.mktime(tt)
+        except (OverflowError, ValueError):
+            # 32 bit systems can't handle dates after Jan 2038, and certain
+            # systems can't handle dates before ~1901-12-01:
+            #
+            # >>> time.mktime((1900, 1, 13, 0, 0, 0, 0, 0, 0))
+            # OverflowError: mktime argument out of range
+            # >>> time.mktime((1850, 1, 13, 0, 0, 0, 0, 0, 0))
+            # ValueError: year out of range
+            #
+            # In this case, we fake the date, because we only care about the
+            # DST flag.
+            tt = (2037,) + tt[1:]
+            stamp = time.mktime(tt)
+        tt = time.localtime(stamp)
+        return tt.tm_isdst > 0