Fix wrong value returned by tzname() for the UTC timezone

Author: sdispater

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Fixed
 
 - Fixed an offset error when subtracting datetimes in the same timezone.
+- Fixed wrong value returned by `tzname()` for the UTC timezone
 
 
 ## [1.4.1] - 2018-02-05

pendulum/tz/timezone.py

@@ -518,7 +518,7 @@ def __getinitargs__(self):
 class _UTC(FixedTimezone):
 
     def __init__(self):
-        super(_UTC, self).__init__(0, 'UTC', TransitionType(0, False, 'GMT'))
+        super(_UTC, self).__init__(0, 'UTC', TransitionType(0, False, 'UTC'))
 
         UTC._tz = self
 

tests/tz_tests/test_timezone.py

@@ -379,3 +379,9 @@ def test_fixed_timezone(self):
 
         self.assertEqual(tz2.utcoffset(dt).total_seconds(), 18000)
         self.assertIsNone(tz2.dst(dt))
+
+    def test_utc_tzname(self):
+        tz = Timezone.load('UTC')
+        dt = datetime(2016, 11, 26)
+
+        assert tz.tzname(dt) == 'UTC'