1 files changed, 47 insertions, 0 deletions
diff --git a/babel/localtime/_fallback.py b/babel/localtime/_fallback.py
new file mode 100644
index 0000000..836f596
--- /dev/null
+++ b/babel/localtime/_fallback.py
@@ -0,0 +1,47 @@
+"""
+    babel.localtime._fallback
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Emulated fallback local timezone when all else fails.
+
+    :copyright: (c) 2013-2023 by the Babel Team.
+    :license: BSD, see LICENSE for more details.
+"""
+
+import datetime
+import time
+
+STDOFFSET = datetime.timedelta(seconds=-time.timezone)
+if time.daylight:
+    DSTOFFSET = datetime.timedelta(seconds=-time.altzone)
+else:
+    DSTOFFSET = STDOFFSET
+
+DSTDIFF = DSTOFFSET - STDOFFSET
+ZERO = datetime.timedelta(0)
+
+
+class _FallbackLocalTimezone(datetime.tzinfo):
+
+    def utcoffset(self, dt: datetime.datetime) -> datetime.timedelta:
+        if self._isdst(dt):
+            return DSTOFFSET
+        else:
+            return STDOFFSET
+
+    def dst(self, dt: datetime.datetime) -> datetime.timedelta:
+        if self._isdst(dt):
+            return DSTDIFF
+        else:
+            return ZERO
+
+    def tzname(self, dt: datetime.datetime) -> str:
+        return time.tzname[self._isdst(dt)]
+
+    def _isdst(self, dt: datetime.datetime) -> bool:
+        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