bug fixed

Author: opensourceworkAR

pandas/types/common.py

@@ -22,9 +22,11 @@
 _NS_DTYPE = np.dtype('M8[ns]')
 _TD_DTYPE = np.dtype('m8[ns]')
 _INT64_DTYPE = np.dtype(np.int64)
+_NS_DTYPE_UTC = DatetimeTZDtype.__new__(DatetimeTZDtype, unit='ns', tz='UTC')
+
 _DATELIKE_DTYPES = set([np.dtype(t)
                         for t in ['M8[ns]', '<M8[ns]', '>M8[ns]',
-                                  'm8[ns]', '<m8[ns]', '>m8[ns]']])
+                                  'm8[ns]', '<m8[ns]', '>m8[ns]']] + [_NS_DTYPE_UTC])
 
 _ensure_float64 = algos.ensure_float64
 _ensure_float32 = algos.ensure_float32