Make ConciseDateFormatter.format_ticks obey tz

 * Also fix conciseDateFormatter.format_data_short

Author: ihincks

lib/matplotlib/dates.py

@@ -752,7 +752,7 @@ def __call__(self, x, pos=None):
         return formatter(x, pos=pos)
 
     def format_ticks(self, values):
-        tickdatetime = [num2date(value) for value in values]
+        tickdatetime = [num2date(value, tz=self._tz) for value in values]
         tickdate = np.array([tdt.timetuple()[:6] for tdt in tickdatetime])
 
         # basic algorithm:
@@ -818,7 +818,7 @@ def get_offset(self):
         return self.offset_string
 
     def format_data_short(self, value):
-        return num2date(value).strftime('%Y-%m-%d %H:%M:%S')
+        return num2date(value, tz=self._tz).strftime('%Y-%m-%d %H:%M:%S')
 
 
 class AutoDateFormatter(ticker.Formatter):